JP5504796B2 - Car lamp lighting circuit - Google Patents

Description

  The present invention relates to an in-vehicle lamp lighting circuit for supplying currents of different magnitudes to an in-vehicle lamp.

  In recent years, the number of in-vehicle devices mounted on a vehicle has increased, and along with this, the number of communication lines connecting each device and power lines for supplying power have also increased. For this reason, there are problems such as an increase in wiring space and cost in the vehicle and a complicated wiring structure. In order to solve such a problem, Patent Document 1 discloses a circuit system that can simplify the wiring of the lamp system.

  The circuit system described in Patent Document 1 is a circuit system for simplifying wiring related to a stop lamp and a tail lamp, which are rear lamps of a vehicle. It functions as a lamp. Specifically, the stop lamp circuit and the tail lamp circuit are configured as the same circuit so that currents of different magnitudes flow in the rear lamp when functioning as a stop lamp and when functioning as a tail lamp. Thus, the rear lamp becomes a stop lamp when lit at 21 W, and becomes a tail lamp when lit at 5 W.

Japanese Patent Application Laid-Open No. 11-189093

  With the circuit system described in Patent Document 1, it has become possible to simplify wiring in a vehicle equipped with a stop lamp and a tail lamp. However, in addition to a stop lamp and a tail lamp, a plurality of on-vehicle lamps such as a high mount stop lamp and a license plate lamp are mounted on the vehicle. For this reason, when the number of on-vehicle lamps increases, Patent Document 1 cannot reliably solve the problem.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an in-vehicle lamp lighting circuit capable of controlling lighting of a plurality of in-vehicle lamps without complicating a wiring structure.

  The on-vehicle lamp lighting circuit according to the present invention includes first and second rectifying elements whose anodes are connected to the positive side of a power source, one end connected to the cathode of the second rectifying element, and the other end of the first rectifying element. A resistor connected to the cathode of the element, a first current path connecting the cathode of the first rectifying element and the first in-vehicle lamp, and an anode of the first rectifying element and the second in-vehicle lamp are connected. And a third current path connecting the anode of the second rectifying element and a third in-vehicle lamp.

  In the present invention, the first on-vehicle lamp is supplied with a current that has passed only through the first rectifier element and a current that has passed through the second rectifier element and the resistor. The latter current is smaller than the former current because it passes through the resistor. Therefore, when the former current flows through the first in-vehicle lamp, the first in-vehicle lamp is lit brighter than in the latter case. As a result, the first on-vehicle lamp has two light emission modes by being lit with different luminance. Further, when a current flows through the first rectifying element, a current also flows through the second current path, and the second on-vehicle lamp is lit. On the other hand, when a current flows through the second rectifying element, a current also flows through the third current path, and the third on-vehicle lamp is lit. That is, when the light emission mode of the first in-vehicle lamp is changed, the second or third in-vehicle lamp can be turned on accordingly. Thereby, it is not necessary to separately configure a circuit for lighting the second and third on-vehicle lamps, wiring can be simplified, and an increase in cost can be suppressed.

  The on-vehicle lamp lighting circuit according to the present invention is characterized in that the second on-vehicle lamp is a high-mount stop lamp and the third on-vehicle lamp is a license plate lamp.

  In the present invention, wiring in a vehicle including a high mount stop lamp and a license plate lamp can be simplified.

  The on-vehicle lamp lighting circuit according to the present invention is characterized in that the first on-vehicle lamp is an on-vehicle lamp that serves as both a stop lamp and a tail lamp.

  In the present invention, the first in-vehicle lamp can also be used as a stop lamp and a tail lamp, so that the number of lamps can be reduced, wiring can be simplified, and an increase in cost can be suppressed.

  In the present invention, the first in-vehicle lamp has two light emission modes by lighting with different luminance. Moreover, when the light emission mode of the first vehicle-mounted lamp is changed, the second or third vehicle-mounted lamp can be turned on accordingly. It is not necessary to separately configure a circuit for lighting the second and third on-vehicle lamps, so that wiring can be simplified and an increase in cost can be suppressed.

It is a circuit diagram showing typically an in-vehicle lamp lighting circuit concerning an embodiment. It is a perspective view which shows the vehicle carrying the vehicle-mounted lamp by which lighting control is carried out by the vehicle-mounted lamp lighting circuit which concerns on embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of an in-vehicle lamp lighting circuit according to the invention will be described with reference to the drawings.

  FIG. 1 is a circuit diagram schematically showing an in-vehicle lamp lighting circuit according to the present embodiment. FIG. 2 is a perspective view showing a vehicle equipped with an in-vehicle lamp that is controlled to be lit by the in-vehicle lamp lighting circuit according to the present embodiment. The on-vehicle lamp lighting circuit according to the present embodiment includes rear lamps (first on-vehicle lamps) 10L and 10R, a high-mount stop lamp (second on-vehicle lamp) 11 and a license plate lamp mounted on the rear portion of the vehicle 100 shown in FIG. (Third on-vehicle lamp) 12 is a circuit for performing lighting control.

  The rear lamps 10L and 10R are a pair of left and right lamps, and function as a stop lamp and a tail lamp by changing the light emission amount. Specifically, when the rear lamps 10L and 10R function as stop lamps, the rear lamps 10L and 10R are lit with a larger light emission amount (for example, five times the light emission amount) than when functioning as a tail lamp. The stop lamp is a lamp that lights up when the brake is depressed. The tail lamp is lit in conjunction with the license plate lamp, and is a lamp for informing the subsequent vehicle of the existence of the host vehicle at night or the like.

  The high-mount stop lamp 11 is a lamp that is installed at a high position at the rear of the vehicle 100 (for example, at the top of the rear window) and lights in conjunction with the stop lamp. The license plate lamp 12 is a lamp for irradiating the license plate 101 at the rear of the vehicle 100.

  The on-vehicle lamp lighting circuit that controls the lighting of each of the lamps 10 to 12 includes a circuit 20 in which a current path for flowing current from the power source Vb to the lamps 10 to 12 is formed, as shown in FIG. Yes. The circuit 20 includes diodes 21 and 22 and a resistor 23.

  The anode of the diode 21 (first rectifying element) is connected to the power source Vb via the junction box (J / B) 40 and the stop lamp switch 15 by, for example, a wire harness. The junction box 40 has a fuse disposed in the middle of the path, and prevents an overcurrent by blowing the fuse when an overcurrent flows. The stop lamp switch 15 is a switch for lighting the rear lamps 10L and 10R as stop lamp switches, and is turned on / off in conjunction with the brake operation. Hereinafter, the wire harness connecting the junction box 40 and the diode 21 is referred to as a stop line 30.

  The diode 21 has a cathode connected to the rear lamps 10L and 10R whose one end is grounded. Specifically, it branches near the cathode of the diode 21 and is connected to each of the rear lamps 10L and 10R. Hereinafter, the wire harnesses that are branched and connected to the rear lamps 10L and 10R are referred to as rear lamp lines (first current paths) 31 and 32.

  The stop line 30 branches near the anode of the diode 21 and is connected to the high-mount stop lamp 11 having one end grounded. That is, when the stop lamp switch 15 is turned on and a current from the power source Vb flows through the stop line 30, a current also flows through the high-mount stop lamp 11. Hereinafter, the wire harness connecting the stop line 30 and the high-mount stop lamp 11 is referred to as a high-mount line (second current path) 33.

  The anode of the diode 22 is connected to the power source Vb via the junction box (J / B) 40 and the tail lamp switch 16. The tail lamp switch 16 is a switch for lighting the rear lamps 10L and 10R as a tail lamp, and is turned on / off in conjunction with the lighting operation of the head lamp. Hereinafter, the wire harness connecting the junction box 40 and the diode 22 is referred to as a tail line 34.

  The cathode of the diode 22 is connected to one end of the resistor 23, and the other end of the resistor 23 is connected to the cathode of the diode 21. Specifically, the other end of the resistor 23 is connected to a point where a wire harness connected to the cathode of the diode 21 branches to the rear lamp lines 31 and 32.

  The tail line 34 branches near the anode of the diode 22 and is connected to the license plate lamp 12. That is, when the tail lamp switch 16 is turned on and a current from the power source Vb flows through the tail line 34, a current also flows through the license plate lamp 12. Hereinafter, the wire harness connecting the tail line 34 and the license plate lamp 12 is referred to as a license line (third current path) 35.

  Next, the operation in the on-vehicle lamp lighting circuit configured as described above will be described. Note that at the start of the operation, the stop lamp switch 15 and the tail lamp switch 16 are both assumed to be off.

  When the brake is stepped on, the stop lamp switch 15 is turned on, and the current from the power source Vb flows through the stop line 30. Then, current is supplied from the diode 21 to the rear lamps 10L and 10R via the rear lamp lines 31 and 32, respectively. Thereby, the rear lamps 10L and 10R are turned on as stop lamps.

  The current flowing through the stop line 30 also flows through the high mount line 33 branched from the stop line 30 and is supplied to the high mount stop lamp 11. As a result, the high-mount stop lamp 11 is lit in conjunction with the rear lamps 10L and 10R that are lit as stop lamps.

  At this time, the current supplied from the diode 21 to the rear lamps 10L and 10R does not flow to the license line 35 due to the rectification function of the diode 22. Accordingly, when the stop lamp switch 15 is on and the tail lamp switch 16 is off, the rear lamps 10L and 10R and the high-mount stop lamp 11 are lit, but the license plate lamp 12 is not lit.

  Thereafter, when the brake is not stepped on, the stop lamp switch 15 is turned off, and no current is supplied to the rear lamps 10L and 10R and the high-mount stop lamp 11. Then, the rear lamps 10L and 10R and the high mount stop lamp 11 are turned off.

  On the other hand, the tail lamp switch 16 is turned on, and the current from the power source Vb flows through the tail line 34. Current is supplied from the diode 22 and the resistor 23 to the rear lamps 10L and 10R via the rear lamp lines 31 and 32, respectively. At this time, since the current supplied to the rear lamps 10L and 10R passes through the resistor 23, it is smaller than the current supplied from the diode 21 to the rear lamps 10L and 10R. For this reason, the rear lamps 10L and 10R are lit with a light emission amount smaller than that when the rear lamps 10L and 10R are lit as stop lamps. Thereby, the rear lamps 10L and 10R are lit as tail lamps.

  The current flowing through the tail line 34 also flows through the license line 35 branched from the tail line 34 and is supplied to the license plate lamp 12. Accordingly, the license plate lamp 12 is lit in conjunction with the rear lamps 10L and 10R that are lit as tail lamps.

  At this time, the current supplied from the diode 22 and the resistor 23 to the rear lamps 10L and 10R does not flow to the high-mount line 33 due to the rectification function of the diode 21. Therefore, when the tail lamp switch 16 is on and the stop lamp switch 15 is off, the rear lamps 10L and 10R and the license plate lamp 12 are lit, but the high-mount stop lamp 11 is not lit.

  When both the stop lamp switch 15 and the tail lamp switch 16 are turned on, both the high-mount stop lamp 11 and the license plate lamp 12 are lit as described above. The rear lamps 10L and 10R are supplied with the current that has passed through the diode 21 and the current that has passed through the diode 22 and the resistor 23, and the rear lamps 10L and 10R are lit as stop lamps that emit a large amount of light.

  As described above, in the present embodiment, the rear lamps 10L and 10R can be turned on as two lamps, that is, a stop lamp and a tail lamp. 11 or the license plate lamp 12 can be turned on. In this case, the high mount stop lamp 11 and the license plate lamp 12 need only be connected to the anodes of the diodes 21 and 22, and a circuit for lighting the high mount stop lamp 11 and the license plate lamp 12 needs to be separately configured. Therefore, the wiring can be simplified and the increase in cost can be suppressed.

  The preferred embodiment of the present invention has been specifically described above, but each configuration, operation, and the like can be changed as appropriate, and are not limited to the above-described embodiment. For example, the circuit 20 may be mounted on the stop line 30, and the installation position of the circuit 20 can be appropriately changed according to the wiring space of the vehicle 100. The installation position may be either the front part or the rear part of the vehicle 100. Further, another in-vehicle lamp may be further added to the in-vehicle lamp lighting circuit according to the present embodiment.

10L, 10R Rear lamp (first in-vehicle lamp)
11 High-mount stop lamp (second on-vehicle lamp)
12 License plate lamp (third in-vehicle lamp)
21 Diode (first rectifier)
22 Diode (second rectifier)
23 Resistance 31, 32 Rear lamp line (first current path)
33 High-mount line (second current path)
34 Tail line (third current path)

Claims (3)

First and second rectifier elements having anodes connected to the positive side of the power source;
A resistor having one end connected to the cathode of the second rectifying element and the other end connected to the cathode of the first rectifying element;
A first current path connecting a cathode of the first rectifying element and a first in-vehicle lamp;
A second current path connecting the anode of the first rectifying element and a second in-vehicle lamp;
A vehicle-mounted lamp lighting circuit comprising: a third current path connecting the anode of the second rectifying element and a third vehicle-mounted lamp. The second on-vehicle lamp is a high-mount stop lamp;
The on-vehicle lamp lighting circuit according to claim 1, wherein the third on-vehicle lamp is a license plate lamp.   The in-vehicle lamp lighting circuit according to claim 1, wherein the first in-vehicle lamp is an in-vehicle lamp that is also used as a stop lamp and a tail lamp.

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