CN2077817U

CN2077817U - Automatic light changing device for mobile headlamp

Info

Publication number: CN2077817U
Application number: CN 90223803
Authority: CN
Inventors: 蔡吉堂
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-11-17
Filing date: 1990-11-17
Publication date: 1991-05-29

Abstract

The utility model relates to an automatic light changing device for headlamp of automobiles, which solves the problem that the existing meeting mode makes the high-beam headlamp of an automobile switched on and switched off alternatively, which obeys the traffic rules and easily leads to traffic accidents. The automatic light changing device for headlamp of automobiles utilizes a light-controlled circuit of meeting headlamps to receive meeting signals and trigger a monostable trigger circuit to turn, a relay is used to control an executive circuit which controls the switching of headlamps to work, the high-beam headlamp of the automobile is switched off, the low-beam headlamp is switched on, a light-detecting circuit of low-beam headlamps receives light signals and outputs high electric level to keep the attraction of the relay, when the meeting is over, the high-beam headlamp returns to conduct illumination, and therefore, the meeting process accords with the traffic regulations.

Description

Automatic light changing device for mobile headlamp

The utility model belongs to lighting device for vehicle, particularly a kind of car headlamp automatic light dimming device.

At present, automobile meeting mainly contains dual mode, a kind of employing manual mode, and this mode is because artificial factor easily causes traffic accident; Another kind of mode adopts the automobile automatic light dimming device, drive relay with op amp or time base circuit, make automobile finish far and near light conversion in going out when bright in Vehicle during Crossing Event when distance light, this mode does not meet safety traffic owing to go out when bright when making country beam.

The purpose of this utility model is to overcome the problem that prior art exists, and closes country beam and switch-on dim light automatically when a kind of meeting is provided, the back of giving another the right of way recovers country beam automatically, makes Vehicle during Crossing Event meet the car headlamp automatic light dimming device of traffic regulation.

The utility model is achieved in that it has an executive circuit that receives the meeting beam control circuit of wigwag far away and control head lamp switch with relay, its special character is, it also has a single-shot trigger circuit and dipped beam slowdown monitoring circuit, the mouth of the triggering termination meeting beam control circuit of said single-shot trigger circuit, the mouth of the mouth of single-shot trigger circuit and dipped beam slowdown monitoring circuit links to each other with the input end of executive circuit respectively, during meeting, country beam makes and can light modulation light-operated circuit output low level trigger the univibrator upset and then make executive circuit work, even relay adhesive, and pass country beam, switch-on dim light, afterwards by dipped beam slowdown monitoring circuit receiving optical signals output high level, keep the relay adhesive, after waiting to give another the right of way, recover the country beam illumination again.

Advantage of the present utility model is, turns off distance light car, switch-on dim light during meeting automatically, recovers country beam behind the meeting automatically, makes Vehicle during Crossing Event meet traffic regulation, helps safe driving.

The drawing explanation:

Fig. 1 is a circuit block diagram of the present utility model;

Fig. 2 is interconnecting wiring diagram of the present utility model (being circuit structure diagram of the present utility model in the frame of broken lines);

The utility model embodiment be provided and elaborate below in conjunction with accompanying drawing:

As Fig. 1; shown in 2; the utility model has one by photoconductive cell (RG1); potential device (W1); the meeting light modulation light-operated circuit that transistor (BG2) and current-limiting resistance (R2) are formed; at positive source with can light modulation be serially connected with the collecting electrode-emitter of relay normally closed contact (J1-2) and transistor (BG1) between the power input (A1) of dividing potential drop branch road of photoelectric switching circuit; between the normally closed contact (J1-2) of relay and ground wire, be serially connected with moment surge when preventing that contact (J1-2) from connecting and cause false triggering; promptly play the resistance (R2) and the electric capacity (C1) of delay protection effect; its node is the base stage of transistor (BG1); adjusting potential device (W1) can change and change electrical distance; mouth (A2) at meeting light modulation flash ranging circuit is connected to by resistance (R3; R4); electric capacity (C2; C3) and the univibrator formed of time base circuit (IC1); said time base circuit (IC1) can adopt time base circuit 555, and said mouth (A2) links to each other with its trigger end.The mouth of single-shot trigger circuit with by transistor (BG4), relay (J1), diode (D1) links to each other with the input end (A3) of the executive circuit that electric capacity (C4) is formed, its input end (A3) also and by being serially connected in photoconductive cell (RG2) between power end and the ground wire and potential device (W2) and base stage is connected on the node of photoconductive cell (RG2) and potential device (W2), collecting electrode is by current-limiting resistance (R5) power connection end, the mouth that emitter is connected on the dipped beam slowdown monitoring circuit that the transistor (BG4) of the input end (A3) of executive circuit forms links to each other, adjustment potential device (W2) can change the sensitivity to the monitoring and the monitoring of surround lighting, said photoconductive cell (RG1, RG2) also can adopt electro-optical tubes.

In actual use, country beam (YD) and passing light (JD) are connected on the normally closed contact (J of the relay that the common port by the control of this light changing device links to each other with power end respectively _1-1) and open contact cooresponding with it on.After this controller energized, when meeting beam impinges upon on the photoconductive cell (RG1), the conducting of transistor (BG2) positive bias, by collecting electrode is mouth (A2) output low level of meeting beam power conversion circuit, make the univibrator upset, the output high level makes transistor (BG4) conducting, relay (J1) adhesive, at this moment, and normally closed contact (J _1-2, J _1-1) open, make the meeting beam control circuit state of deactivating, avoided misoperation, turn off country beam (YD) simultaneously, switch-on dim light (JD).After (t second), univibrator resets through after a while, its mouth output low level; This moment, passing light made transistor (BG3) conducting, and its emitter output high level is kept relay (J1) adhesive, and then kept the dipped beam meeting.After giving another the right of way, the input end of executive circuit (A3) is a low level, relay (J1) is discharged, normally closed contact (J1-1, J1-2) adhesive, and then open country beam (YD), turn off passing light (JD), and the power supply of the dividing potential drop branch road of connection meeting light modulation light-operated circuit, adopt electro-optical tubes to replace the working process of photoconductive cell identical with said process.

Claims

1, a kind of car headlamp automatic light dimming device, comprise meeting beam control circuit that receives the country beam signal and the executive circuit of controlling head lamp switch with relay, it is characterized in that, it also has a single-shot trigger circuit and dipped beam slowdown monitoring circuit, the trigger end of said single-shot trigger circuit links to each other with the mouth of passing lamp light-operated circuit, and the mouth of the mouth of single-shot trigger circuit and dipped beam slowdown monitoring circuit links to each other with the input end of executive circuit respectively.

2, according to the said car headlamp automatic light dimming device of claim 1, it is characterized in that said dipped beam slowdown monitoring circuit is formed by the transistor (BG4) that current-limiting resistance (R5) power connection end, emitter are connected on the input end (A3) of executive circuit by being serially connected in node, the collecting electrode that photosensor (RG2) between power end and the ground wire and potential device (W2) and base stage be connected on photosensor (RG2) and potential device (W2).

3, according to shining the car automatic light dimming device before claim 1 or the 2 said automobiles, it is characterized in that, at the power input (A of power positive end with the dividing potential drop branch road of meeting light modulation light-operated circuit ₁), between be serially connected with the normally closed contact (J of relay (J1) _1-2) and the collecting electrode-emitter of transistor (BG1), at normally closed contact (J _1-2) and ground wire between be serially connected with resistance (R2) and the electric capacity (C1) that prevents the false triggering monostable circuit, said resistance (R2) and electric capacity (C ₁) node connect the base stage of transistor (BG1).