JP2836091B2 - Motorcycle lamp circuit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle lamp circuit that is suitable for a motorcycle that travels with a headlamp turned on, especially during daytime running. .

(Prior Art) Recently, for the purpose of increasing visibility, a motorcycle often turns on a headlamp even during daytime driving, and in some countries, this is obligatory. However, if this lighting is performed with a high beam, it is very dazzling for oncoming vehicles. A conventional lamp circuit will be described with reference to FIG. Reference numeral 1 denotes a battery as a power supply, and the negative side is a vehicle body grounded (hereinafter, referred to as ground). An ignition switch 4 and a lighting switch 5 are connected in series to the battery 1 via a breaker 2 and a fuse 3.

A dimmer switch 6 and a passing switch 7 are connected in parallel to the lighting switch 5, and a coil 9 of a relay 8 is connected between these and a ground circuit. When the dimmer switch 6 is closed, the coil 8 is energized to switch to the low beam side. The relay 8 has a movable contact 10 which is moved by excitation and non-excitation of the coil 9, a normally closed contact 11, and a normally open contact 12. A high beam filament 13 is provided between the normally closed contact 11 and ground, and a normally open contact 12 is grounded. A low beam filament 14 is connected between them. These high beam filament 13 and low beam filament
14 constitutes a headlamp.

In the conventional circuit having such a connection, when the ignition switch 4 and the lighting switch 5 are closed and the dimmer switch 6 is closed or opened to control the energization of the coil 9, the headlamp can be controlled. Performs downward or upward irradiation. The passing switch 7 is used for instantaneously turning on the high beam when the low beam is turned on.

(Problems to be Solved by the Invention) In such a conventional circuit, there is a problem that it is difficult for the driver himself to judge whether it is a low beam or a high beam now because the surroundings are sufficiently bright during daytime driving. . Therefore, there is a possibility that the oncoming vehicle may be unintentionally dazzled.

The present invention has been made in view of this point, and provides a circuit in which low beam lighting is always performed when the lighting switch is closed.

(Means for Solving the Problems) The present invention provides a means for solving the above problems by connecting a low beam filament 14 between a normally open contact 12 of a relay 8 and a ground circuit, A high beam filament 13 is connected to the ground circuit and the movable contact 10 is connected to a power supply. One end of the coil 9 of the relay 8 is connected to a power supply via the lighting switch 5 and the other end is connected to a control circuit.
When the dimmer switch 6 and the passing switch 7 are connected to the control circuit 15 and the dimmer switch 6 is closed to the high beam side, the coil 9 is excited and the low beam filament 14 is energized. Thereafter, when the passing switch 7 is closed, the coil 9 is de-energized and the high beam filament 13 is energized.

(Operation) With such a configuration, even if the dimmer switch 6 is set to the high beam side while the lighting switch 5 is closed, the control circuit 15 controls the energization of the coil 9 of the relay 8 so that only the low beam side is always set. Since the power is not supplied, the oncoming vehicle is not dazzled.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 and the same parts as those in FIG. In the present invention, a control circuit 15 using a transistor is provided. The control circuit 15 is provided with three transistors 16, 17, 18 and includes resistors 19 to 22 and a diode.
The dimmer switch 6, the passing switch 7, and the coil 9 of the relay 8 are connected by 23 and 24 as shown in the figure. The transistors 16, 17, and 18 are connected in this manner, so that when the preceding transistor is on, the subsequent transistor is off.

Now, when the dimmer switch 6 is closed with the ignition switch 4 and the lighting switch 5 closed (the display becomes a high beam), the transistor 16 is turned on, the transistor 17 is turned off, and the transistor 18 is turned on. 9 is energized, the movable contact 10 contacts the normally open contact 12 side, and the low beam filament 14 is turned on. Therefore, this is done in daytime running. At night, when the high beam side is desired, the passing switch 7 is pressed and closed. As a result, the transistor 17 is turned on, and the transistor 18 is turned off.
Since no current flows through the coil 9 of the relay 8, the movable contact 10 returns to the normally closed contact 11 side, and the high-beam filament
A current is applied to 13 to light it.

When the energization of the coil 9 of the relay 8 is cut off, the potential at the point A becomes H level, a current flows through the path of the diode 24 and the dimmer switch 6, and the transistor 17 continues to be turned on. The state of the high beam continues even if the hand is released from 7 and opened. Next, to switch from this state to the low beam side, the dimmer switch 6 may be opened. This shuts off the power supply that backed up the transistor 17, so the transistors 16, 1
7 and 18 are turned on, off and on, respectively, and as a result, the low beam filament 14 is turned on. To switch from the low beam state to the high beam state, the dimmer switch 6 and the passing switch 7 may be closed.

(Effect of the Invention) Since the present invention is a motorcycle lamp circuit configured as described above, even if the dimmer switch is mistakenly set to the high beam side when the lighting switch is closed, control is performed unless the passing switch is turned on. Since the circuit is always on the low beam side by the circuit, it does not run on the high beam side during daytime running, and does not give a dazzle to the driver of the oncoming vehicle. In addition, since a conventionally used circuit can be used as it is, it can be easily applied to an existing vehicle.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of one embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional example. 1 ... battery 4 ... ignition switch 5 ... lighting switch 6 ... dimmer switch 7 ... passing switch 8 ... relay 9 ... coil 10 ... movable contact 11 ... normally closed contact 12 ... normally open contact 13 …… High beam filament 14 …… Low beam filament 15 …… Control circuit 16,17,18 …… Transistor

Claims (1)

(57) [Claims] A low beam filament is connected between a normally open contact of a relay and a ground circuit, a high beam filament is connected between the normally closed contact and the ground circuit, and a movable contact is connected to a power supply. One end of the coil of the relay is connected to a power supply via a lighting switch, the other end is connected to the last stage of a control circuit, a dimmer switch and a passing switch are connected to the control circuit, and the dimmer switch is closed to the high beam side. A lamp circuit for a motorcycle, wherein the coil is energized to energize the low-beam filament, and thereafter, when the passing switch is closed, the coil is de-energized to energize the high-beam filament.