JPS6348439Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lighting control device for an in-vehicle audio device, which controls the display brightness of a panel surface of an in-vehicle audio device such as a car radio or a car stereo.

In recent years, there has been a trend toward the adoption of electronic automobile meters that use luminescent indicators such as fluorescent display tubes to display various measurement information as the vehicle travels. There is a well-known device that detects daytime through a 100-degree sensor and guarantees the minimum brightness of the electronic meter by limiting the voltage level of the control pulse, thereby making it possible to control the electronic meter to the appropriate brightness both during the day and at night. (For example, Japanese Patent Application Laid-Open No. 56-46422).

By the way, for in-vehicle audio equipment such as car radios and car stereos, the brightness of the lighting equipment that illuminates the panel surface of the in-vehicle audio equipment is displayed on the panel surface during the day and at night in the same way as the electronic meter described above. In order to make it easy to see, it is desirable to be able to control the brightness to an appropriate level. Conventionally, in this type of in-vehicle audio equipment, the lighting equipment that illuminates the panel surface of the in-vehicle audio equipment is powered from a small light power source, and is powered from an accessory power source. This is a common ground with the in-vehicle audio equipment that receives power.

For this reason, even if an attempt was made to control the brightness of the lighting fixtures of the in-vehicle audio equipment using a panel controller for adjusting the brightness of the electronic meter for automobiles, which consists of a variable resistor or the like connected to the ground side, it would not be possible to control the brightness. Also,
When the brightness of the lighting equipment is controlled by an electronic panel controller that controls the brightness of the electronic meter for cars by changing the duty ratio of the control pulses, the control pulses are controlled by the noise prevention capacitor of the car audio equipment. There was a problem that the brightness was not controlled as described above.

The present invention was developed in view of the above-mentioned circumstances regarding in-vehicle audio equipment, and is a DC-DC converter that controls the power supply to the lighting equipment of the in-vehicle audio equipment according to the voltage applied to the instrument lighting equipment of the vehicle. By providing a DC-DC converter, the control voltage of the instrument lighting is proportionally converted, and the brightness of the instrument lighting and the lighting of the in-vehicle audio equipment is adjusted. The purpose is to provide equipment.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment in which the lighting of a vehicle-mounted audio device is controlled by an electronic panel controller that controls the brightness of a vehicle electronic meter by changing the duty ratio of control pulses.

In FIG. 1, 11 is an electronic illumination controller that controls the brightness of the electronic automobile meter 12 by changing the duty ratio of control pulses, and 13 is an electronic illumination controller whose output is determined by the voltage Va applied to the electronic automobile meter 12. DC controlled voltage
- a DC converter; 14 is a car radio as an in-vehicle audio device; and 15 is a lamp as an audio device illumination device that illuminates the panel surface of the car radio 14.

The above electronic illumination controller 11
and the automobile electronic meter 12 are connected in series between a small light system power supply line 16 connected to a small light system power supply and the ground.

On the other hand, the DC-DC converter 13 is connected together with the car radio 14 between the grounded lamp 15 and the small light system power line 16,
A voltage Va is applied to the electronic meter 12 from a connection point 17 between the electronic illumination controller 11 and the automobile electronic meter 12, and its output voltage Vb is controlled by the voltage Va.

The car radio 14, which is commonly grounded with the lamp 15, is supplied with power from an accessory power supply line 18 connected to an accessory power supply.

In the above manner, the electronic illumination controller 11 controls the electronic meter 12 for the automobile.
When the brightness of the automobile electronic meter 1 is changed,
2 changes, and the output voltage Vb of the DC-DC converter 13 changes in response to the change in voltage Va.
The electronic illumination controller 11 changes the electronic meter 12 and the lamp 1 for the automobile.
5 brightness levels can be controlled simultaneously.

In the embodiment shown in FIG. The output voltage Vb of the lamp 13 is a direct current, which solves the problem inherent in the conventional duty control method in which the control pulse of the electronic illumination controller 11 is dulled by the feedthrough capacitor 19, making it impossible to control the brightness of the lamp 15. be done.

Next, another embodiment of the present invention is shown in FIG.

In the embodiment shown in FIG. 2, an electronic automobile meter 12 is connected to the small light system power supply line 16 side in the embodiment shown in FIG. 12 and ground, a variable resistance type illumination controller 21 for controlling the brightness of the above-mentioned automobile electronic meter 12 is connected, and a connection point 17' between the automobile electronic meter 12 and the variable resistance type illumination controller 21 is connected between the electric vehicle meter 12 and the ground. Voltage Va to DC−
The brightness of the lamp 15 is controlled by inputting it to the DC converter 13.

Even with the above configuration, by adjusting the variable resistance type illumination controller 21, the brightness of the automobile electronic meter 12 and the lamp 15 can be controlled simultaneously.

In addition, in the case of this embodiment, the lamp 15 is DC-DC
Since power is supplied from the converter 13, it is effective even when the capacity of the variable resistance type illumination controller 21 is insufficient.

The present invention can be widely applied to in-vehicle audio equipment such as car stereos in addition to car radios.

As is clear from the detailed explanation above, the present invention uses a DC-DC converter to proportionally convert the control voltage of the instrument lighting to supply power to the lighting of the in-vehicle audio equipment. A voltage corresponding to the voltage supplied to the instrument lighting of the vehicle is supplied to the lighting of the vehicle-mounted audio equipment, and the brightness of the lighting of the vehicle's instrument lighting and the lighting of the vehicle-mounted audio equipment can be adjusted simultaneously.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a lighting control device for vehicle-mounted audio equipment according to the present invention, and FIG. 2 is a block diagram of a modification of FIG. 1. 11...Electronic illumination controller, 12...Automotive electronic meter, 13...DC
-DC converter, 14...Car radio, 15...Lamp, 16...Small light power line, 1
7, 17'...Connection point, 18...Accessory power line, 21...Variable resistance type illumination controller.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Audio equipment connected to an accessory system power source, audio equipment lighting fixtures that are powered from a light system power source and grounded in common with the above audio equipment, and meters that are connected to a light system power source. an illumination controller that controls the power supply to the instrument lighting fixtures and performs dimming, and a DC-DC converter that inputs the voltage applied to the instrument lighting fixtures and controls the power supply to the audio equipment lighting fixtures according to the input. A lighting control device for in-vehicle audio equipment, characterized by comprising: (2) The lighting control device for a vehicle-mounted audio device according to claim 1, wherein the illumination controller performs dimming by duty control.