CN2136768Y

CN2136768Y - Alarm device for measuring reverse distance for car

Info

Publication number: CN2136768Y
Application number: CN 92221397
Authority: CN
Inventors: 任鸿林; 杨正农
Original assignee: Jiang Xiongxi
Current assignee: Jiang Xiongxi
Priority date: 1992-09-29
Filing date: 1992-09-29
Publication date: 1993-06-23
Anticipated expiration: 2002-09-29

Abstract

The utility model relates to an alarm device for measuring reverse distance for a car, comprising an infrared emitting source 1, a light coupling receiver 2, an amplifier 3, a mixing sampler 4, a noise sampler 5, a subtracter 6, a light alarm indicator 7, an alarm generator 8 and a sound warning device 9. Due to the fact that the alarm device for measuring reverse distance for a car respectively sample the distance measuring mixing signal and a noise signal and makes the subtraction, the disturbance resisting capacity and the measuring precision are obviously improved. Furthermore, due to the fact that the conditional flashing alarm and the flashing and sound double alarm are adopted, the reverse operation of the driver is convenient.

Description

Alarm device for measuring reverse distance for car

The utility model relates to a kind of distance measuring equipment (DME), specifically, is a kind of device of the tailstock to the distance of obstacle of measuring when being used for reversing automobile.

Have not yet to see the relevant distance measuring equipment (DME) that is used for reversing automobile, therefore, when the driver moves backward, always use the obstacle of eye fixation tailstock foreign side on one side, on one side steering wheel rotation, even, also often there are other people outside car, doing gesture and cooperate the driver to finish the reversing operation, make us feeling inconvenience while calling out.

The purpose of this utility model provides a kind of reversing automobile range finding warning device.

The utility model is to implement like this: at the tailstock stroboscopic light sources is set, and outwards emission, and by photo coupler reception reflected light, divide the two-way sampling, the one tunnel gathers the mixed signal of being made up of optical signal and noise signal, one road acquisition noise signal, again they are imposed subtraction, obtain optical signal level.Flashing light alarm when adopting distance behind the tailstock for L1, when adopting distance for L2, sound, light double knock.As mentioned above, the utility model comprises that infrared light emissive source, light lotus root close receptor, amplifier, No. two samplers, subtracter, alarm generator, flashing light alarm indicating device harmony annunciator.

The utility model has the advantages that: 1, layer of structure is clearly demarcated, and is easy to implement; 2, good in anti-interference performance; 3, easy to use.

The utility model is implemented by the following drawings.

Fig. 1 is a use scheme drawing of the present utility model.

Fig. 2 is an electrical schematic diagram of the present utility model.

Below we will provide better embodiment of the utility model according to Fig. 2.Simultaneously, by description, provide ins and outs of the present utility model to this embodiment.From scheming as seen, the utility model comprises infrared light emissive source 1, close the optical receiver 2 of connection with 1 one-tenth light lotus root of this infrared light emissive source, amplifier 3 with 2 one-tenth circuit connections of this optical receiver, after be connected to this amplifier 3, and be subjected to the mixed signal sampler 4 and the noise samples device 5 of 1 control of infrared light emissive source respectively, this two

sampler

4,5 output signal subtracts each other rear feed light inlet alarm indicator 7 through subtracter 6, drawing setting alarm level end by this light alarm indicator 7 again is connected with alarm generator 8, flashing light alarm takes place during for L1 in the distance that is implemented in the tailstock and obstacle, and distance takes place to glisten and the sound double knock during for L2.Again from Fig. 2 as seen, in the present embodiment, infrared light emissive source 1 comprises oscillating unit 11, phase switch 12 and the luminescence unit 13 that becomes circuit to connect successively.Oscillating unit 11 is connected to the resistance R 113 and the R114 of input and output side of NAND gate IC111 respectively by two-stage not gate IC111, IC112 and the capacitor C 115 that is connected to the mouth of NAND gate IC112 constitutes.Phase switch 12 is made of the not gate IC121, the IC122 that become circuit to connect in turn, by not gate IC121 output inversion signal, remove switching noise sampler 5, go switch luminescence unit 13 and mixed signal sampler 4 luminescence units 13 to constitute by transistor BG131, base resistance R132, collector resitance R133 and the infrarede emitting diode D134 that is connected on the emitter circuit of transistor BG131 by not gate IC122 output common-mode signal.Like this, the impulse singla that is produced by oscillating unit 11 removes to drive luminescence unit 13 behind phase switch 12, make its infrarede emitting diode D134 produce the pulsed optical signals of uniform strength, and reflect to optical receiver 2 from obstacle and to be received, optical receiver 2 is made up of with the resistance R 22 that is connected on collector loop infrared photo-transistor BG21, its is transformed into corresponding electric signal feed-in amplifier 3 with the tailstock with the intensity of reflected light that the distance of obstacle is directly proportional, and amplifier 3 is by the rp-op amp 31 that becomes circuit to connect successively, voltage follower 32 and rp-op amp 33 constitute.Because optical receiver 2 is when infrared light emissive source 1 is luminous, what receive is range finding optical signal and bias light signal---be called mixed signal and received when infrared photo-emission source 1 is not luminous background signal---is referred to as noise signal, thereby the mixed signal of amplifier 3 corresponding generations and noise signal be feed-in mixing sampler 4 and noise samples device 5 respectively.In order to improve survey precision, require that these two samplers, 4,5 structures are identical, technical index is consistent.They keep capacitor C 42, C52 and 43,53 of rp-op amps to constitute by the gating switch 41,51 that becomes circuit to connect successively, sampling respectively.Wherein, gating switch 41 with 51 respectively with infrared light emissive source 1 in phase switch 12 in not gate IC121 and the mouth of the IC122 mixing that detected and the noise signal electric signal of after subtracter 6 computings, just being found range accurately that is connected, improved antijamming capability significantly.The subtracter 6 of present embodiment is a subtraction amplifier, and its electric signal feed-in light alarm indicator 7 of will finding range, one-tenth wait the branch level to show apart from light.The optical indicator 7 of present embodiment is made of level indication IC 70 and eight light-emitting diode D71-D78 that become circuit to connect with its eight mouths and the common ground path aerotron BG79 that connects these eight light-emitting diode D71-D78, and to characterize the tailstock to obstacle distance from it be level output end (zone bit) the output alarm conditioned signal of L1 and L2, feed-in alarm generator 8, output signal by this alarm generator 8 removes to control aerotron BG79 again, makes flashing light alarm takes place when distance is L1 and L2.Alarm generator 8 is made of warning oscillating unit 81 and judgement unit 82 taking alarm thereafter, and the oscillating unit 81 of wherein reporting to the police provides the warning electric signal, and it is made up of secondary not gate IC811, IC812 and oscillation circuit Resistor-Capacitor Unit R813, R814, C815.Warning judgement unit 82 is made up of two joint denial gate IC821, IC822, they have the input end of a parallel connection to be connected with the warning oscillating unit, the input end of IC821 is connected with the zone bit A that represents distance L 1, the input end of IC822 is connected with the zone bit B that represents distance L 2, the mouth of IC821 is connected with transistor BG79, the mouth of IC822 is connected with acoustic alarm device 9, and the acoustic alarm device 9 in the present embodiment is by transistor BG91 and and load L92(loudspeaker) constitute.So, when zone bit A and B are " 1 ", do not report to the police, when they are " 0 ", double knock takes place, promptly the oscillation frequency according to warning oscillating unit 81 produces the blinker light indication and the sound; When zone bit A is " 0 " and B during for " 1 ", have only the blinker light indication to report to the police.

Claims

1, a kind of reversing automobile range finding alarm comprises that infrared light emissive source 1, light lotus root close receptor 2 and connect amplifier 3 thereafter and light alarm indicator 7 harmony annunciators 9, it is characterized in that:

A. two the mixing samplers arranged side by side 4 and noise samples device 5, subtracter 6 and alarm generator 8 that are connected to amplifier 3 after also having and join with circuit successively, this alarm generator 8 is controlled light alarm indicator 7 harmony annunciators 9 respectively, be connected to subtracter 8 behind the light alarm indicator 7

B. infrared light emissive source 1 comprises oscillating unit 11, phase switch 12 and the luminescence unit 13 that becomes circuit to connect successively, and its phase switch 12 connects with 4 one-tenth homophases of luminescence unit 13 and mixing sampler respectively, with 5 one-tenth anti-phase connections of noise samples device.

2, according to the described alarm of claim 1, it is characterized in that mixing sampler 4 and comprise that the gating switch 41, the sampling that become circuit to connect successively keep capacitor C 42 and rp-op amp 43,12 one-tenth circuit of gating switch 41 and phase switch connect.

3, according to the described alarm of claim 1, it is characterized in that noise samples device 5 comprises that the gating switch 51, the sampling that become circuit to connect successively keep capacitor C 52 and rp-op amp 53,12 one-tenth circuit of gating switch 51 and phase switch connect.

4, according to the described alarm of claim 1, it is characterized in that light alarm indicator 7 is classification optical display units that are directly proportional with the tailstock to barrier during backing distance, constitute by level indication integrated circuit block IC70 and eight light-emitting diode D71-D78 that become circuit to connect with its eight mouths and the common ground path transistor BG79 that connects these eight light-emitting diode D71-D78.

5, according to claim 1 or 4 described alarms, it is characterized in that alarm generator 8 comprises warning oscillating unit 81 and the warning judgement unit 82 that becomes circuit to connect successively, wherein, the input end of warning judgement unit 82 becomes circuit to connect with the zone bit A of the L1 of level indication integrated circuit block IC70 output and the zone bit B of L2 respectively, its corresponding output end respectively with 9 one-tenth circuit connections of common ground path transistor BG79 harmony annunciator.

6, according to the described alarm of claim 5, the judgement unit 82 that it is characterized in that reporting to the police is made up of two joint denial gate IC821 and IC822, and 81 one-tenth circuit of their input end in parallel and warning oscillating unit connect, and another input end is connected with B with zone bit A respectively.