CN1651282A

CN1651282A - Sensor head having wave guide cone

Info

Publication number: CN1651282A
Application number: CN 200410003835
Authority: CN
Inventors: 李世雄
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-02-06
Filing date: 2004-02-06
Publication date: 2005-08-10

Abstract

A sensing head with wave guide cone for the astern radar system features that a wave guide cone is arranged at the external end of ultrasonic sensor for gathering the ultrasonic waves in a particular direction to obtain stronger ultrasonic echo. It is possible to instal an electrothermal wire to it for thawing snow.

Description

Sensing head with guided wave awl

Technical field

The present invention is about a kind of sensing head with guided wave awl, and it is in a kind of sensing head that applies to the ultrasonic transduter of reversing radar of vehicle system.

Background technology

Reverse radar system is finished existing considerable time by development, and in recent years owing to the driver improves constantly the requirement of vehicle quality, the standard that makes reverse radar system almost become the new listing vehicle is equipped with.At car rear bumper arm place one ultrasonic transduter is installed at modal reverse radar system on the market at present, its emission hypracoustic principle is under the effect of polarized electric field, ceramic chip in the sensor drives the aluminium shell and vibrates, thereby outwards launch super sonic owing to inverse piezoelectric effect; When outside ultrasonic waves transmitted can be reflected when meeting with obstacle, and the reflection in active distance promptly can be received by sensor and inform the driver through system.

When the design ultrasonic transduter, preferably can allow the super sonic that sends concentrate on a certain zone, and can allow stronger reflection is arranged when bumping obstacle in this zone, to obtain preferable sensing effect, analyze with existing ultrasonic transduter sensing region, its service area promptly as shown in Figure 5, this zone with receiving sensitivity＞-6dB drawn by test value and formed, its distance on the outside linearly extended axis of sensor slightly surpasses 250cm, but wide 60 degree that reach of its induction angle in the 200cm distance, this promptly makes the accuracy rate on the practice be subjected to considerable influence.

The a certain este wagon newer with Japan designs, it is before car, a plurality of sensors have all been installed on the rear bumper arm additional, and settled a display panel in the instrument carrier panel side of operator's saddle, when certain sensor sensing arrives near obstacle, the LED of this position promptly can glimmer and reminds the driver on the display panel, but because the existing sensors sensing angle is accurate inadequately, make the designer of this car have to and to be designed to the arc angle structure around the safety lever of front and back, and the sensor of both sides is installed in corner, with the super sonic biased outward emission that makes two side sensers send, in order to avoid with the plane on the sensor settled interfere with each other and accurate certain position of disturbance in judgement thing, this kind design is subject to the super sonic diffusion angle broad that sensor sends, to make each sensor install between every being widened, must cause it to survey the reduction of accuracy rate;

With regard to another angle analysis, because its two side senser adopts the mode in the oblique outside to install, make its probability that senses the side direction obstacle improve, the service condition that path space is limited according to the narrow people in ground is thick, when stopping reversing warehouse-in and with other spacing when nearer, its two side senser promptly can send caution, but in fact the obstacle of side is not within the direction of traffic of reversing, even this this sensor loses actual effect, the interference that causes the driver to control even, obviously this type of sensor still has improved necessity in design.

Summary of the invention

For improving the defective of prior art, the invention provides a kind of sensing head with guided wave awl, it can concentrate on the super sonic that the sensing head of sensor is launched a certain specific region, and when in this zone, meeting with obstacle, stronger reflection can be arranged, use the induction Effect on Detecting that provides preferable.

For reaching above-mentioned purpose, main purpose of the present invention provides a kind of sensing head with guided wave awl, the sensing head outer end of its sensor is provided with guided wave awl, setting by this guided wave awl, the super sonic guiding that sensor is sent is concentrated to specific direction, and the ultrasonic wave energy that order is launched concentrates on a certain specific region, and when in these specific regions, running into obstacle, can obtain stronger backward wave, to improve the inductive effects of sensing head; In addition, in this sensing head, can install the heater strip that snow melt is used additional, and can solve that there is accumulated snow the sensor outer end and the problem that influences sensitivity.

Description of drawings

Fig. 1 is a preferred embodiment element decomposing schematic representation of the present invention.

Fig. 2 is the entire combination generalized section of the preferred embodiment of the present invention first figure.

Fig. 3 is the effective sensing region distribution graph of ultrasonic transduter of the present invention.

Fig. 4 is the frequency-decibel comparison diagram of sensing head after not establishing the guided wave awl and having set up the guided wave awl under the same conditions.

Fig. 5 is the existing effective sensing region distribution graph of ultrasonic transduter.

Nomenclature among the figure:

10 sensing heads, 12 leads

20 sheaths, 22 accommodation chambers

240 times retainings of 24 outer cone mouths are protruding

26 location edges, 30 guided waves awl

32 poles, 34 heating wires

40 shells, 42 assembly chamber

420 edge clippings, 44 bonnets

50 fillers

The specific embodiment

See also shown in Figure 1ly, be preferred embodiment element decomposing schematic representation of the present invention, demonstrate a sensing head 10, a sheath 20, guided wave awl 30 among the figure and for the shell 40 of assembling usefulness.

This sensing head 10 is identical with general prior art, and end extends within it lead 12;

This sheath 20 is generally made with the rubber material, its inboard be formed with can ccontaining sensing head 10 accommodation chamber 22 (as shown in Figure 2), form an outer cone mouth 24 in these sheath 20 outer ends, these outer cone mouth 24 lower edges be formed with keep off protruding 240 its avoid super sonic directive ground and reflect cause false sense should, ora terminalis forms a loop mapping edge 26 in these sheath 20 outside faces again;

The outer end of this guided wave awl 30 is cone-shaped, and it is arranged on outer cone mouth 24 central authorities that align sheath 20, and can make this guided wave awl 30 just be positioned at the place, outer ends of sensing head 10 when sensing head 10 is placed in the accommodation chamber 22 of this sheath 20; As can be known, this guided wave awl 30 is erected at one and is on the pole 32 of Contraband font, then is provided with a heating wire 34 again in this pole 32 shown in cooperation Fig. 2;

40 on shell can be made styling design according to the stack-mounted vehicle, is provided with one for sheath 20 stack-mounted assembly chamber 42 in this shell 40, is provided with a bonnet that can cover mutually 44 in shell 40 rear ends simultaneously.

Cooperate the combination generalized section of consulting Fig. 2, the entire combination state of preferred embodiment among Fig. 1 wherein of the present invention as can be seen, wherein guided wave awl 30 is set up in the sheath 20 by pole 32, this pole 32 portion incorporated therein when sheath 20 moulding in the embodiment shown in the figure, make guided wave awl 30 convexedly stretch in outer cone mouth 24 centre of sheath 20, the section that can see this guided wave awl 30 thus in the section-drawing is the taper of a water droplet shape, and 34 of heating wires extend to the inner along pole 32;

Sensing head 10 is assembled in the accommodation chamber 22 of sheath 20, and the outer face contact of sensing head 10 end place within guided wave awl 30, and lead 12 extends internally;

Sheath 20 is assembled in the assembling grove 42 of shell 40, the location edge that the is arranged in shell 40 outside faces location, an edge clipping 420 places that assembling grove 42 forms that reclines, and bonnet 44 is covered on shell 40 rear sides and finishes assembling;

Pass bonnet 44 in lead shown in the figure 12 and heating wire 34 direct extensions, actual product then is provided with breach and passes for lead 12 and heating wire 34 in the bonnet edge, and characteristic of the present invention place, its non-pass is not so add to give unnecessary details; In addition, can fill filler 50 in the assembly chamber 42 between bonnet 44 inboards and sheath 20 and sensing head 10 rear ends, it can be resin or suitable material, to make sheath 20 and sensing head 10 firm being placed in shell 40 assembly chamber 42.

Sensing head 10 of the present invention has been set up guided wave awl 30 its sensing regions of back as shown in Figure 3, the specification of this sensing head 10 is identical with existing product, this zone still with receiving sensitivity＞-6dB drawn by test value and formed, its distance on the outside linearly extended axis of sensor reached 320cm approximately, and its induction angle in the 200cm distance is spent less than 50, compare with the existing product among Fig. 5, obvious sensing head of the present invention will have better accuracy rate than existing product.

See it by Fig. 4 again, the comparison diagram of its sensing head under the same conditions after not establishing the guided wave awl and having set up guided wave awl of the present invention, its detecting location is the same distance person of recording on the outside linearly extended axis of sensing head, wherein solid line sign person is the Effect on Detecting of having set up after guided wave of the present invention is bored, dotted line sign person does not then establish the sensing head Effect on Detecting of guided wave awl, its under test frequency 40kHz the super sonic decibels that can provide, wherein demonstrating the sensing head that the sensing head that has installed guided wave awl of the present invention additional will be unkitted the guided wave awl really has better Effect on Detecting.

In addition, bore in 30 poles 32 at guided wave of the present invention and can settle a heating wire 34, it can be deposited in the accumulated snow in the sensor outside in order to thawing, to solve that there is accumulated snow in the sensor outside and the problem that influences Effect on Detecting, it is a quite excellent design really, and mere formality is filed an application in accordance with the law.

Claims

1. the sensing head with guided wave awl is characterized in that, the sensing head outer end that is used for the reverse radar system ultrasonic transduter is provided with guided wave awl.

2. the sensing head with guided wave awl as claimed in claim 1, wherein this sensor comprises a sensing head, a sheath, guided wave awl,

This sensing head is held to extend within it lead;

This sheath is made with the rubber material, its inboard be formed with can ccontaining sensing head accommodation chamber, form an outer cone mouth in this sheath external end;

The outer end of this guided wave awl is cone-shaped, and it is assembled in the place, outer end of sensing head, and aligns the outer cone mouth central authorities of sheath.

3. the sensing head with guided wave awl as claimed in claim 1 or 2, wherein the section of this guided wave awl is the taper of a water droplet shape.

4. the sensing head with guided wave awl as claimed in claim 1 or 2, wherein the outer face contact of sensing head end place within the guided wave awl.

5. the sensing head with guided wave awl as claimed in claim 2, wherein the outer cone mouth lower edge of this sheath external end be formed with keep off protruding.

6. the sensing head with guided wave awl as claimed in claim 2, wherein ora terminalis forms a loop mapping edge in this jacket outer surface, forms a corresponding edge clipping in shell assembly chamber.

7. the sensing head with guided wave awl as claimed in claim 2, wherein this guided wave awl is erected at one and is on the pole of Contraband font.

8. the sensing head with guided wave awl as claimed in claim 7 wherein is provided with a heating wire in this pole.

9. the sensing head with guided wave awl as claimed in claim 2, wherein this sensor includes a shell in addition, is provided with one in this shell for sheath stack-mounted assembly chamber, is provided with a bonnet that can cover mutually at outer casing back simultaneously.

10. the sensing head with guided wave awl as claimed in claim 9 wherein can be filled filler in the assembly chamber between bonnet inboard and sheath and sensing head rear end.