JPS63287638A - Method for turning on lamp in vehicle - Google Patents

Abstract

PURPOSE:To avoid the brightness from decreasing when a filament breaks, by providing a means, which switches the connection of plural electric lamps to the series and parallel connections for a power source, and turning on the lamps through current limiting means switching the connection to the parallel connection when the filament breaks. CONSTITUTION:When no filament breaks in both electric lamps 1A, 1B, they are turned on being connected in series for a power source by a selector means 2. On the contrary, for instance, the electric lamp 1A, if its filament breaks, is detected by a filament break detecting means 3, and the connection of the lamps is switched to the parallel connection for the power supply by the selector means 2. Here the electric lamp 1B with no generation of its filament break is turned on by the original brightness as a result because current limiting means 4A, 4B, which generate the rated voltage, are connected in series. Accordingly, even if a filament break is generated in one part of the plural electric lamps, the visibility can be prevented from decreasing by turning on the lamp in the brightness satisfying a rule of the relating legislation.

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD 1 The present invention relates to a vehicle lamp installed in an automobile or the like, and specifically relates to a lighting method thereof.

[Prior art 1] Fig. 2 shows a conventional vehicle lamp of this type.
At least two light bulbs 22 and 23 are installed in the tail light/brake light 21 part, which is especially important for maintaining safety, so that even if one of the light bulbs breaks, the light will not turn on. This is something that care is taken to avoid. The illustrated example is the most common tail light/brake light 21, and includes a light bulb 22.
23 uses double filament of 7W/21W respectively, when the taillight is on (7W x 2 = 14W) and when the brake light is on (21W x 2 = 42W), the brake light is about 3 times the taillight (42W ÷ 14W = 3), which makes it easy to distinguish between taillights and brake lights that are lit in the same color at the same location. Problem to be Solved by the Invention 1 However, the conventional vehicle lights mentioned above are always turned on with the same voltage, and if one of them is broken, the brightness will be halved and visibility will be reduced. In addition, for example, if one of the brake light filaments breaks in the tail light/brake light 21 portion, the tail light and brake light described above may be damaged. Which brightness ratio is 1.5 (8 (21W ÷ 14W = 1
．． 5), which caused the problem that identification became difficult. Means for Solving Problem K] The present invention is a specific means for solving the above-mentioned conventional problems, in which a plurality of light bulbs are disposed inside a single light such as a tail light/t, II a light, etc. In the lighting method for a vehicle lamp, there is provided a switching means for switching the plurality of light bulbs between series connection and parallel connection with respect to a power source; and a core breakage detection means for detecting a core breakage in any one of the plurality of light bulbs and driving the cutting means, and when the core breakage detection means does not detect a core breakage, the switching means The bulb is lit in series connection to the power source, and when a break is detected, the bulb is connected in parallel to the power source and the current ! The above-mentioned conventional problems are solved by providing a lighting method for a vehicle lamp, which is characterized in that lighting can be checked through a +11 limiter. K Embodiment Next, the present invention will be described in detail based on an embodiment shown in the drawings. Reference numerals 1A and IB in FIG. 1 indicate light bulbs, and in order to avoid unnecessarily cluttering the explanation, this embodiment will be explained using an example of two light bulbs. This light bulb 1Δ,
1B is connected in series to a power source via a normally closed contact NG of switching means 2, such as a relay, and disconnection detection means 3 is connected to the current paths of the light bulbs 1A and 1B. This disconnection detection means 3 is, for example, a voltage comparison circuit 3a, and when the detection side input terminal voltage V1 of the voltage comparison circuit 3a is greater than the standard side input terminal voltage VS, that is, when neither the bulbs 1A and 1B are disconnected, the output is This causes the output transistor 3b to be connected to the relay coil 2 of the switching means 2.
Without driving a, the contact is a normally closed contact N
The light bulbs 1A and 1B located on the O side are connected in series to the power supply, and when either of the light bulbs 1A or 1B, for example the light bulb 1A, breaks, the detection side input terminal voltage v1 is no longer generated and the detection side input terminal voltage Vl<fl quasi-side input terminal voltage V
s and produces an output to the voltage comparator circuit 3a, and the output transistor 3b drives the relay coil 4a to switch the contact to the normal oven side No. and connect the light bulbs 1A and 1B in parallel to the power source. At this time, the light bulb IA,
Each of 1B is provided with current limiting means 4△, / by a resistor or the like.
According to the lighting method of the present invention, in which the IBs are connected in series and the rated voltage of the bulb 1A and IB is not exceeded, the bulb 1A,
1B is connected in series to the power supply by the switching means 2 when there is no breakage, and therefore the light is turned on at 1/2 of the power supply voltage, and the original brightness is reduced. Lights up dimly with limited brightness.
Further, when a break occurs in one of the light bulbs, for example, the light bulb 1A, the switching means 2 responds to the output of the breakage detecting means 3.
Connected in parallel to the power supply, and at an appropriate voltage,
For example, since the commercial current limiting means 4A and 4B, which are set to the rated voltage, are connected in series, the light bulb 1B, which is not broken, lights up with its original brightness. Here, the rated voltage of the light bulbs 1A and 1B used in this embodiment will be explained in more detail. If the brightness of a single lamp lit at the rated voltage is the same and satisfies the regulations regulated by relevant laws and regulations, the regulations will be met not only in normal conditions but also when a single lamp is disconnected. be able to. In addition, the above explanation is based on resistors, connections, etc. so that the function can be clearly shown. 1, etc., but the present invention is not limited thereto, and in actual implementation, for example, a semiconductor switching circuit incorporating an oscillation circuit with an appropriate duty ratio may be used as the current limiting means 4A14B. In normal operation, the oscillation circuit is stopped and power is continuously supplied, and - breakage detection means 5 detects when the lamp is broken.
This can be implemented by causing the oscillation circuit to oscillate in accordance with the output of the oscillator and supplying power intermittently, and it is also naturally possible to replace the relay with a semiconductor switching circuit or the like. Furthermore, although the explanation has been made assuming that the light bulbs 1A and 1B are single filament bulbs, for example, when the bulbs are double filament bulbs for taillights/brake lights, it is of course possible to carry out the same lighting method for each filament. It goes without saying that this is the case, and it goes without saying that its implementation does not detract from the gist of the present invention. [Effects of the Invention] As explained above, according to the present invention, the lighting method of a vehicle lamp is changed to the original brightness by connecting the light bulb in series to the power source using the switching means when no core breakage is detected by the core breakage detection means. By lighting the bulb at a dimmer level than the brightness, and when a core break is detected, the current is set to the rated voltage via the current limiting means, and the bulb is lit at its original brightness, thereby reducing the number of bulbs in the lamp. Regardless of whether a part of the lamp is broken or not, the lamp shall be lit with a brightness that satisfies the provisions of the relevant laws and regulations, and furthermore, it may cause a decrease in visibility or misidentification of taillights and brake lights. This has an excellent effect on improving safety.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram showing an embodiment of the lighting method for a vehicle lamp according to the present invention, and FIG. 2 is a sectional view showing a conventional example. 1A, 1B...Light bulb 2...Switching means 2a...Relay coil NC...Normally closed contact No....Normally open contact 3...Disconnected Detection means 3a...Voltage comparison circuit 3b...Output transistors 4A, 4B...Current limiting means v1...Detection side input terminal voltage Vs...Standard side input terminal voltage Patent applicant Stanley Electric Co., Ltd. Figure 1 2nd cause

Claims (1)

[Claims] A method for lighting a vehicle light fixture such as a taillight/brake light in which a plurality of light bulbs are arranged in an integrated light fixture, including a switching means for switching between series connection and parallel connection of the plurality of light bulbs to a power source, and the switching means a current limiting means connected in series to each of the plurality of light bulbs when connected in parallel; and a breakage detection means for detecting breakage of any one of the plurality of light bulbs and driving the switching means; When the breakage is not detected by the breakage detecting means, the switching means lights the light bulb in series connection to the power source, and when a breakage is detected, the light bulb is connected in parallel to the power source and the light bulb is lit in parallel to the power source, and A method for lighting a vehicle lamp, characterized in that the lighting is turned on via a restricting means.