JPS6261853A - Control method for auxiliary stop lamp - Google Patents

Abstract

PURPOSE:To eliminate incongruous feeling of both lamps under driving condition by providing a drive delay means in an auxiliary stop lamp employing a LED as the light source then slowing the rising and falling while synchronizing the light emission characteristic with that of main stop lamp. CONSTITUTION:A brake switch 5 is turned on to control an auxiliary stop lamp 3 through a main stop lamp 2 and a delay circuit 6 thus to feed current to both stop lamps 2, 3. When rising, it will take considerable time to achieve red heat thus to provide slow response while when falling, the after glow due to the remaining heat is matched with a slow incandescent bulb thus to slow the rising and falling of the auxiliary stop lamp 3 employing a LED as a light source through function of a resistor 9, a capacitor 8 and a transistor 7 in a delay circuit 6 and to synchronize the light emission characteristic. Consequent ly, incongruous feeling such as alternate lighting condition of both stop lamps 2, 3 can be eliminated.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention uses an LED as a light source, which is attached to the rear of a vehicle such as an automobile, for example, inside or outside of a rear window, the top of a roof, a spoiler, etc. The present invention relates to the ultH1 method of an auxiliary stop lamp.

[Conventional technology]

Generally, this type of auxiliary stop lamp is connected to the brake switch in parallel with the main stop lamp whose light source is an incandescent bulb, and when the brake switch is operated, the auxiliary stop lamp turns on and off together with the main stop lamp. There is.

However, incandescent light bulbs and LEDs have different light emission characteristics, that is, characteristics in rising and falling. To explain this characteristic with reference to the chart in Figure 4, A indicates on/off of the brake switch, and 8 indicates on/off of the LED.
Off and C indicate on and off of the incandescent light bulb, respectively. When the switch is turned on by stepping on the brake, the LED
The rise of the light is steep, and the fall of the light is also steep even when the brake switch is off, and the light is emitted and extinguished at the same time as the brake switch is driven. On the other hand, in an incandescent light bulb, it takes some time for the filament to become red hot after being turned on, and the v1 is slow, and even after the light bulb has been turned off, residual heat remains in the filament and the light goes out slowly. Therefore, if the brake is depressed many times in a short period of time, the main brake lamp and the auxiliary brake lamp will turn on alternately, giving the viewer a sense of discomfort, which is undesirable.

(Problems to be Solved by the Invention) The main brake lamp of the present invention uses an incandescent bulb as a light source, and while the incandescent bulb has a slow response and has an afterglow characteristic, the auxiliary brake lamp uses an LED as a light source. , LED
This is an attempt to solve the problem of discomfort due to a drive shift between the two, which is caused by the steep response of the two.

[Means for solving problems]

The present invention provides a main stop lamp using an incandescent lamp as a light source and a LE lamp as a specific means for solving the above problems.
Connect D in parallel with an auxiliary stop lamp as a light source,
The auxiliary stop lamp is provided with a drive delay means, and the main stop lamp and the drive delay means are connected so that they operate simultaneously when the brake switch is operated, and the drive delay means controls the rise and fall of the auxiliary stop lamp. This invention provides a control method for an auxiliary stop lamp, characterized in that the light emitting characteristics of the auxiliary stop lamp are substantially synchronized with those of the main stop lamp by slowing down the auxiliary stop lamp. A delay circuit consisting of a transistor that drives the transistor, a backflow prevention diode connected to the base side of the transistor, a resistor, and a capacitor is provided, and the delay circuit and the main stop lamp are connected in parallel via a brake switch. This is an auxiliary stop lamp control II device that approximates the light emission characteristics of an auxiliary stop lamp that uses an LED as a light source to the characteristics of a main stop lamp that uses an incandescent bulb as a light source, thereby reducing the sense of discomfort in the driving state of both lamps. I lost it.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment. Reference numeral 1 is an automobile, and a main stop lamp 2 is attached to the rear of the automobile by being incorporated into a rear combination lamp. This main stop lamp 2 uses an incandescent light bulb as a light source. An auxiliary stop lamp 3 is attached, for example, to the inside or outside of a rear window so as to be lit at the same time as the main stop lamp 2, and the auxiliary stop lamp 3 uses an LED as a light source.

The main stop lamp 2 and the auxiliary stop lamp 3 are:
They are connected as shown in the circuit configuration shown in FIG. That is, both stop lamps 2.3 are connected in parallel to the power source 4, the main stop lamp 2 is connected via the brake switch 5, and delay means for controlling the main stop lamp 2 and the auxiliary stop lamp 3; That is, the delay circuit 6 is connected in parallel and driven simultaneously by turning on and off the brake switch 5. And the incandescent bulb 2a of the main stop lamp 2 and the LE of the auxiliary stop lamp 3
Although the light emission characteristics are different from those of D3a, they are controlled by the delay circuit 6 and have similar light emission characteristics. This delay circuit 6 includes a transistor 7 whose collector and emitter are connected to the ground side of the auxiliary stop lamp 3, a capacitor 8 and a resistor 11 whose collector and emitter are connected to the base side of the transistor in parallel, and a resistor 11 which is connected in series to the base. It is composed of a resistor 9 and a backflow prevention diode 10.

[For production]

The operation of the device that implements the control method configured as described above will be explained with reference to the chart in FIG. 3 is controlled and current is supplied to both stop lamps at the same time, but as mentioned above, it takes time for the incandescent light bulb 2a to become red hot at the time of startup, and the response is slow. In accordance with this, in the delay circuit 6, the rise of the transistor 7 is delayed by the time constants of the resistor 9 and the capacitor 8, thereby delaying the lighting of the LED 3a of the auxiliary stop lamp 3. That is, the rise of the transistor 7 is delayed while the current supplied through the resistor 9 charges the capacitor 8, and the time constant is determined by the resistance value and capacitance, and the time constant of the incandescent lamp 2a is determined by the resistance value and capacitance. It is sufficient to approximate the rise characteristic.

Furthermore, as described above, when the brake switch 5 is turned off, the incandescent bulb 2a of the main stop lamp 2 has an afterglow due to the residual heat of the filament and slowly falls, and the LED 3
In a, when the brake switch 5 is turned off, the capacitor 8 is discharged and the transistor 7 is kept conductive for a while, so the fall becomes slow, and accordingly, ED3a
falls slowly in the same way as the incandescent light bulb 2a. Therefore, the delay circuit 6 causes the rise and fall of the LED 3a of the auxiliary stop lamp 3 to be approximately synchronized with the rise and fall of the incandescent bulb 2a.

〔Effect of the invention〕

As explained above, the method for controlling an auxiliary stop lamp according to the present invention uses a delay means to slow the rise and fall of the drive of the auxiliary stop lamp that uses an LED as a light source, thereby changing the light emitting characteristics of the auxiliary stop lamp to that of the main stop lamp. Since the light emitting characteristics of the incandescent light bulbs are almost synchronized, even if the main and auxiliary stop lamps are installed on the back side of the vehicle, they are driven with almost similar rise and fall times, so you won't feel any discomfort at all. It has a great effect.

In addition, the device for implementing the control method includes a transistor for driving the auxiliary stop lamp, a diode for preventing reverse current connected to the base side of the transistor, and a delay circuit consisting of a resistor and a capacitor. hand,
The time constant of the resistor and capacitor slows down the rise and fall of the transistor and synchronizes the drive of the ED with the light emitting characteristics of the incandescent lamp. Adjustment for synchronization is extremely easy, and the structure is simple. It has an excellent effect of being able to perform simple yet reliable driving.

[Brief explanation of the drawing]

FIG. 1 is a rear view of an example vehicle equipped with an auxiliary stop lamp driven by the fill tX1 method according to the present invention, and FIG. 2 is a schematic circuit diagram of a device implementing the ij control method. FIG. 3 is a chart showing the light emission characteristics of an LED, a brake switch, and an incandescent light bulb controlled by the same control method in correspondence, and FIG. 4 is a chart similar to FIG. 3 in the conventional example. 1...Car 2...Main stop lamp 2a...Incandescent light bulb 3...Auxiliary stop lamp 3a...LED 4...Power source 5...Brake switch 6...Delay circuit 7...・Transistor 8... Capacitor 9.11... Resistor 10... Diode for backflow prevention Patent applicant Stanley Electric Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 7 Contents of amendment Procedure Correction image Showa Ge month 2, 60

Claims (1)

[Claims] (1) A main stop lamp using an incandescent light bulb as a light source and an auxiliary stop lamp using an LED as a light source are connected in parallel to the power supply, and the auxiliary stop lamp is provided with a drive delay means, so that when the brake switch is operated, A main stop lamp and the driving delay means are connected so as to operate simultaneously, and the driving delay means slows the rise and fall of the auxiliary stop lamp so that its light emission characteristics are substantially synchronized with the main stop lamp. A method of controlling an auxiliary stop lamp characterized by: