CN205720738U - Automobile-used rain sensor and lens arrangement thereof - Google Patents
Automobile-used rain sensor and lens arrangement thereof Download PDFInfo
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- CN205720738U CN205720738U CN201620185950.0U CN201620185950U CN205720738U CN 205720738 U CN205720738 U CN 205720738U CN 201620185950 U CN201620185950 U CN 201620185950U CN 205720738 U CN205720738 U CN 205720738U
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- light
- rain sensor
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Abstract
This utility model relates to a kind of automobile-used rain sensor, including light emission assembly, optical transmitting set, diversing lens, light-receiving assembly, optical receiver, receive lens, coupling layer and glass, this optical transmitting set is positioned on this light emission assembly, this optical receiver is positioned on this light-receiving assembly, this diversing lens and this reception lens are coupled on this glass by this coupling layer and are spaced setting, this light emission assembly is towards this diversing lens, this light-receiving assembly is towards these reception lens, wherein: this diversing lens and these reception lens respectively include Part I and Part II, this Part I upper surface is distributed sawtooth, this Part II protrudes from Part I lower surface, and the lower surface of this Part II has groove；This light emission assembly is towards the groove of the Part II of this diversing lens, and this light-receiving assembly is towards the groove of the Part II of these reception lens.This utility model further relates to a kind of lens arrangement.
Description
Technical field
This utility model relates to a kind of sensor, especially relates to a kind of automobile-used rain sensor and lens arrangement thereof.
Background technology
On automobile, rain sensor is mainly used in sensing the size of raindrop on windshield, thus is automatically adjusted wiper operation speed, provides the good visual field for driver.Applying wider rain sensor at present is optical sensor and capacitance type sensor respectively, owing to capacitance type sensor is arranged on the outer surface of windshield, its coat of metal can quickly be scratched by windshield, so optical sensor is than more by technical concerns under the long-term work of rain brush.
According to optical principle, when light is by optically denser medium directive optically thinner medium, refraction angle will be greater than angle of incidence.When angle of incidence increases to a certain numerical value, refraction angle is up to 90 °, at this moment will occur without refraction light in optically thinner medium, as long as angle of incidence is more than or equal to above-mentioned numerical value, the most no longer there is refraction effect, here it is total reflection.
Optical profile type rain sensor is i.e. the total reflection principle work according to light.Fig. 1 is the structure chart of a kind of known optical profile type rain sensor.As it is shown in figure 1, sensor generally comprises optical transmitting set 105, optical receiver 107, diversing lens 104, receives lens 108 and lens board 103.Optical transmitting set 105 and optical receiver 107 interval are arranged facing to windshield 101.Diversing lens 104 is located between optical transmitting set 105 and glass 101, receives lens 108 and is located between optical receiver 107 and glass 101.Lens board 103 is used for carrying diversing lens 104 and receiving lens 108.The light that optical transmitting set 105 sends passes through collection and the arrangement of diversing lens 104, penetrates coupling layer 102 and projects the inner surface of windshield 101.When without rain, the outer surface of glass 101 is air, is optically thinner medium relative to glass 101, can be totally reflected when angle of incidence is more than critical angle, and the most all light can converge on optical receiver 107 by receiving the arrangement of lens 108；When rainy, owing to the medium of windshield 101 outer surface changes, having some light and be refracted to outside glass 101, the light intensity that optical receiver 107 receives changes.Optical profile type rain sensor is through this change and judges whether to rain and rainfall size.
For most important in optical profile type rain sensor be to include diversing lens 104 and receive the optical lens parts of lens 108.Traditional lens tilt towards windshield, need bigger space.Holographic structure is by means of diffraction principle, but has the defect of principle itself, causes that luminous efficiency is low, stray light is big.The lens of Fig. 1 are the improvement of Fresnel lens, can accomplish the size thinner than traditional convex lens, and reach the effect of optically focused equally.
But there is certain problem in this lens arrangement: this structural requirement light source (such as the optical transmitting set 105 of Fig. 1) all must be necessarily arranged at focus f of lens (diversing lens 104)；If the size of sensor is done thin, it is desirable to a less focal length, thus the sawtooth on lens is made very small, the most shallow, but be difficulty with in actual processing and manufacturing；If the distance of light source distance lens centre o is more than focal distance f, then having more veiling glare 106 will not be collected into, and these veiling glares even can interfere with the receiving terminal of light.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of automobile-used rain sensor and lens arrangement thereof, is adapted to different light sources, makes relatively thin size, and converges more incident illumination.
This utility model employed technical scheme comprise that a kind of automobile-used rain sensor for solving above-mentioned technical problem, including light emission assembly, optical transmitting set, diversing lens, light-receiving assembly, optical receiver, receive lens, coupling layer and glass, this optical transmitting set is positioned on this light emission assembly, this optical receiver is positioned on this light-receiving assembly, this diversing lens and this reception lens are coupled on this glass by this coupling layer and are spaced setting, this light emission assembly is towards this diversing lens, this light-receiving assembly is towards these reception lens, wherein: this diversing lens and these reception lens respectively include Part I and Part II, the upper surface of this Part I or lower surface are Fresnel lens structure, this Part II protrudes from Part I lower surface, and the lower surface of this Part II has groove；This light emission assembly is towards the groove of the Part II of this diversing lens, and this light-receiving assembly is towards the groove of the Part II of these reception lens.
In an embodiment of the present utility model, this light emission assembly and this light-receiving assembly have depression, and this optical transmitting set and this optical receiver lay respectively in the depression of this light emission assembly and this light-receiving assembly.
In an embodiment of the present utility model, the shape of the periphery inner surface of this Part II is total reflection to light.
In an embodiment of the present utility model, the lower extreme point of the Part II of this diversing lens is less than the line extended line of the emitting edge of this optical transmitting set and the edge of this light emission assembly, and the lower extreme point of the Part II of these reception lens is less than the line extended line at the light edge of this optical receiver and the edge of this light-receiving assembly.
In an embodiment of the present utility model, sensor also includes lens board, is used for carrying this this diversing lens and these reception lens.
This utility model also proposes the lens arrangement of a kind of automobile-used rain sensor, including Part I and Part II, this Part I is Fresnel lens structure in the cylindrical and upper surface of this Part I or lower surface, this Part II is positioned at this Part I lower surface, and the lower surface of this Part II has groove.
In an embodiment of the present utility model, the shape of the periphery inner surface of this Part II is total reflection to light.
This utility model, owing to using above technical scheme, is allowed to compared with prior art, has a following remarkable advantage:
1, consider the light from light source edge due to the Part II of lens, therefore can collect most of light that light source sends；For receiving terminal, then receptor can be collected through the whole light receiving lens.
2, have adjusted the distance between light source and lens, same ray-collecting effect can be reached by changing the parameter of the Part II of lens, therefore can whole sensor is made the thinnest.
3, due to the existence of Part II, in existing design, small-sized and that required precision is high sawtooth can be left in the basket, and difficulty of processing is substantially reduced.
Accompanying drawing explanation
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent, below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is elaborated, wherein:
Fig. 1 is the structure chart of a kind of known optical profile type rain sensor.
Fig. 2 A is the axonometric chart of the lens arrangement of the optical profile type rain sensor of this utility model one embodiment.
Fig. 2 B is the top view of the lens arrangement of the optical profile type rain sensor of this utility model one embodiment.
Fig. 2 C is the sectional view of the lens arrangement of the optical profile type rain sensor of this utility model one embodiment.
Fig. 3 is optical profile type rain sensor and the index path thereof of this utility model one embodiment.
Fig. 4 is the light path details of the lens collection optical transmitting set edge veiling glare of the optical profile type rain sensor of this utility model one embodiment.
Detailed description of the invention
Fig. 2 A is the top view of the lens arrangement of the optical profile type rain sensor of this utility model one embodiment.Fig. 2 B is the axonometric chart of the lens arrangement of the optical profile type rain sensor of this utility model one embodiment.Fig. 2 C is the sectional view of the lens arrangement of the optical profile type rain sensor of this utility model one embodiment.With reference to shown in Fig. 2 A-2C, the lens arrangement of the automobile-used rain sensor of the present embodiment includes Part I 210 and Part II 220.The upper surface of Part I 210 is distributed sawtooth 211.The shape of these sawtooth 211 can be different.The effect of sawtooth 211 is the light that Part II 220 is collected to be converted into certain angle project on the windshield of automobile.Part II 220 protrudes from Part I 210 lower surface, and the lower surface of Part II 220 has groove 221.
Compare existing lens arrangement, the groove 221 on the Part II 220 of the lens of the present embodiment, completely optical transmitting set or optical receiver can be covered on wherein, thus collect light to a greater extent.
In Fig. 2 A illustrated embodiment, the upper surface at Part I 210 is distributed sawtooth 211 to constitute Fresnel lens structure.In another embodiment of the present utility model, Fresnel lens structure can be arranged on the lower surface of Part I 210, i.e. sawtooth can be distributed in the lower surface of Part I 210.
In shape, the Part I 210 of lens is generally in cylinder, and Part II 220 is generally in truncated cone-shaped.
The size of lens is typically determined by the size of light source, and in actual application, the diameter dimension of lens is 4mm-10mm, and thickness is 5mm-15mm.The material of lens is generally polymethyl methacrylate (PMMA) or Merlon (PC), can be manufactured by injection molding manner.
Fig. 3 is optical profile type rain sensor and the index path thereof of this utility model one embodiment.As it is shown on figure 3, the automobile-used rain sensor of the present embodiment includes light emission assembly 305, optical transmitting set 307, diversing lens 304, light-receiving assembly 309, optical receiver 308, receives lens 310, lens board 303, coupling layer 302 and glass 301.Optical transmitting set 307 is positioned on light emission assembly 305, and optical receiver 308 is positioned on light-receiving assembly 309.Diversing lens 304 and reception lens 310 are coupled on glass 301 and are spaced setting by coupling layer 302.Light emission assembly 305 is towards diversing lens 304, and light-receiving assembly 309 is towards receiving lens 310.Lens board 303 is used for carrying diversing lens 304 and receiving lens 310.
Diversing lens 304 and the reception lens 310 of the present embodiment use structure shown in Fig. 2.Specifically, diversing lens 304 includes Part I 410 and Part II 420.Part I 410 upper surface is distributed sawtooth 411 to constitute Fresnel lens structure, and Part II 420 protrudes from Part I 410 lower surface, and the lower surface of Part II 420 has groove 421.Light emission assembly 305 is towards the groove 421 of the Part II 420 of diversing lens 304.Similarly, receive lens 310 and include Part I 510 and Part II 520.Part I 510 upper surface is distributed sawtooth 511 to constitute Fresnel lens structure, and Part II 520 protrudes from Part I 510 lower surface, and the lower surface of Part II 520 has groove 521.Light-receiving assembly 309 is towards the groove 521 of the Part II 520 receiving lens 310.
In another embodiment of the present utility model, the Fresnel lens structure that sawtooth is constituted can also be arranged on the lower surface of the Part I 410 of diversing lens 304, or Fresnel lens structure can be arranged on the lower surface of the Part I 510 receiving lens 310.
It is preferred that light emission assembly 305 and light-receiving assembly 309 are respectively provided with in the depression that depression, optical transmitting set 307 and optical receiver 308 lay respectively at light emission assembly 305 and light-receiving assembly 309.Being refracted into diversing lens 304 from the light beam of optical transmitting set 307 injection through light emission assembly 305 convergence, diversing lens 304 not only collects the mid portion light that optical transmitting set 307 sends, and may utilize total reflection principle simultaneously and collects optical transmitting set 307 edge veiling glare.The Fresnel lens structure of light beam emitted lens 304 upper surface (or lower surface) is converted to directional light and enters coupling layer 302.After coupling layer 302, this light beam is refracted and enters glass 301 and reflect in the opposite inner face of glass 301.Then, this light beam again passes through glass 301, enters coupling layer 302, and according to light path principle of reversibility, final light beam incides on optical receiver 308.
Further, the periphery inner surface of the Part II 420 of diversing lens 304 is preferably devised to total reflection, to reduce light losing as far as possible.Fig. 4 illustrates lens and collects the light path details of optical transmitting set edge veiling glare.As shown in Figure 4, by optical transmitting set 307 light that edge-emission goes out, the first surface 401 of diversing lens 304 is projected1, on this surface, light can occur the refraction of certain angle, from refraction theorem, β 2 ＜ β 1.After light enters diversing lens 304, project inner lens surfaces 4012On, project inner surface 401 after there is full transmitting3On, wherein second surface 4012With the 3rd surface 4013Designing at a certain angle, angular range is 90 degree of-180 degree, and the optimal number of degrees are 120 degree, and so, diversing lens 304 can produce the phenomenon of total reflection.
Owing to light is dredged material (air) by light close material (PMMA) directive light, critical angle can be calculated according to total reflection law and be about 45 °, and angle of incidence is equal to angle of reflection, therefore can calculate to obtain γ 1=γ 2=α 1=α 2 ＞ 45 °.By the interior angle of triangle and can release equal to 180 ° again, will reach entirely to launch the condition of generation, second surface 4012With the 3rd surface 4013Angle theta have to be larger than 90 °.For receiving lens 310, same.
Further, whole light that diversing lens 304 preferably optical transmitting set 307 sends.To this end, the lower extreme point 401 of the Part II 420 of diversing lens 3044Need the line extended line of the emitting edge less than optical transmitting set 307 and the edge of light emission assembly 305.Due to light path is reversible, therefore at receiving terminal, identical design, the lower extreme point of the Part II 520 i.e. receiving lens 310 can be used to need the line extended line at the light edge less than optical receiver 308 and the edge of light-receiving assembly 309.
Compared with existing lens arrangement, above-described embodiment of the present utility model has a following characteristics:
1, the light from light source edge is considered due to the Part II of lens, therefore most of light that light source sends can be collected, when using the preferred configuration of relativeness at the edge considering Part II lower extreme point and optical transmitting set, whole light that light source sends can be collected；For receiving terminal, then receptor can be collected through the whole light receiving lens.
2, have adjusted the distance between light source and lens, same ray-collecting effect can be reached by changing the parameter of the Part II of lens, therefore can whole sensor is made the thinnest.
3, due to the existence of Part II, in existing design, small-sized and that required precision is high sawtooth can be left in the basket, and difficulty of processing is substantially reduced.
Although this utility model describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is intended merely to this utility model is described, change or the replacement of various equivalence also can be made in the case of without departing from this utility model spirit, therefore, as long as change, the modification of above-described embodiment all will be fallen in the range of following claims in spirit of the present utility model.
Claims (7)
1. an automobile-used rain sensor, it is characterised in that include light emission assembly, optical transmitting set, diversing lens,
Light-receiving assembly, optical receiver, reception lens, coupling layer and glass, it is total that this optical transmitting set is positioned at this light emission
Cheng Shang, this optical receiver is positioned on this light-receiving assembly, and this diversing lens and these reception lens are by this coupling layer coupling
Arranging together on this glass and interval, this light emission assembly is towards this diversing lens, and this light-receiving assembly connects towards this
Receive lens, wherein:
This diversing lens and these reception lens respectively include Part I and Part II, the upper surface of this Part I
Or lower surface is Fresnel lens structure, this Part II protrudes from Part I lower surface, and this Part II
Lower surface has groove；This light emission assembly towards the groove of the Part II of this diversing lens, this light-receiving assembly
Groove towards the Part II of these reception lens.
Automobile-used rain sensor the most as claimed in claim 1, it is characterised in that this light emission assembly and this light
Receiving assembly and have depression, this optical transmitting set and this optical receiver lay respectively at this light emission assembly and this light-receiving is total
In the depression become.
Automobile-used rain sensor the most as claimed in claim 1, it is characterised in that in the periphery of this Part II
The shape on surface is total reflection to light.
Automobile-used rain sensor the most as claimed in claim 1, it is characterised in that second of this diversing lens
The lower extreme point divided is less than the line extended line of the emitting edge of this optical transmitting set and the edge of this light emission assembly,
And the lower extreme point of the Part II of these reception lens is less than light edge and this light-receiving assembly of this optical receiver
The line extended line at edge.
Automobile-used rain sensor the most as claimed in claim 1, it is characterised in that also include lens board, be used for
Carry this diversing lens and these reception lens.
6. the lens arrangement of an automobile-used rain sensor, it is characterised in that include Part I and Part II,
This Part I is Fresnel lens structure in the cylindrical and upper surface of this Part I or lower surface, this second
Divide and be positioned at this Part I lower surface, and the lower surface of this Part II has groove.
The lens arrangement of automobile-used rain sensor the most as claimed in claim 6, it is characterised in that this second
The shape of the periphery inner surface divided is total reflection to light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620185950.0U CN205720738U (en) | 2016-03-11 | 2016-03-11 | Automobile-used rain sensor and lens arrangement thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620185950.0U CN205720738U (en) | 2016-03-11 | 2016-03-11 | Automobile-used rain sensor and lens arrangement thereof |
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| Publication Number | Publication Date |
|---|---|
| CN205720738U true CN205720738U (en) | 2016-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620185950.0U Expired - Fee Related CN205720738U (en) | 2016-03-11 | 2016-03-11 | Automobile-used rain sensor and lens arrangement thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205720738U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107179567A (en) * | 2016-03-11 | 2017-09-19 | 武汉拉法叶科技有限责任公司 | Automobile-used rain sensor and its optical lens |
| CN107340550A (en) * | 2017-08-09 | 2017-11-10 | 江苏日盈电子股份有限公司 | Multifunction Sensor |
-
2016
- 2016-03-11 CN CN201620185950.0U patent/CN205720738U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107179567A (en) * | 2016-03-11 | 2017-09-19 | 武汉拉法叶科技有限责任公司 | Automobile-used rain sensor and its optical lens |
| CN107340550A (en) * | 2017-08-09 | 2017-11-10 | 江苏日盈电子股份有限公司 | Multifunction Sensor |
| CN107340550B (en) * | 2017-08-09 | 2023-09-12 | 江苏日盈电子股份有限公司 | Multifunctional sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161123 Termination date: 20200311 |
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| CF01 | Termination of patent right due to non-payment of annual fee |