JPH0121058Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an instrument lighting device for illuminating various instruments on an automobile instrument panel.

2. Description of the Related Art In general, the illuminance of the night lights of various instruments on an automobile instrument panel can be adjusted for the purpose of preventing glare or according to the driver's preference.

Conventionally, in this type of instrument lighting device, as shown in FIG.
There is one that allows you to make the adjustment in step 1. In addition, as shown in Figure 2, the control unit can be adjusted by adjusting the variable resistor VR2.
There is a device in which the control pulse width of CONT is made variable and the driver Q is driven by the pulse signal, thereby adjusting the illuminance of the lamp PL2. Note that OSC in the figure indicates a pulse oscillator.

Normally, in the case of the former type of instrument lighting device, the heat generated by the variable resistor VR1 is a problem, so it is used with a load capacity of about 20W or less, and the load capacity is
For power outputs of around 20W or more, we use the latter pulse control method.

However, since the pulse control method drives the lamp in pulses, it is unavoidable that high frequencies are generated, which causes noise to enter car radios and other electronic instruments. It has become necessary to use it separately from those instruments.

Therefore, for instruments where noise contamination is a problem, it is necessary to separately install a variable resistor type as shown in Figure 1 to adjust the illuminance. Adjustments must be made with respect to the resistance type, making the operation complicated and making it difficult to keep each adjustment level constant.

Purpose This invention was made taking the above points into consideration.
To provide an instrument lighting device that allows easy adjustment of illuminance of various instruments at the same level when a pulse control type and a variable resistance type are used together depending on the various instruments. .

Configuration An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 3, the instrument lighting device according to the present invention includes a variable resistance type illuminance adjustment circuit 1 that adjusts the illuminance of the instrument illumination lamp PL1 where noise contamination is a problem, and a When connecting the illuminance adjustment circuit 2 using the pulse control method that adjusts the illuminance of the illumination lamp PL2 of the instrument, which does not cause any problem, in parallel to the battery BATT, the illuminance adjustment circuit 1 can be Variable resistor shown in Figure 1
Both circuits are connected so that VR1 and the variable resistor VR2 shown in FIG. 2 in the illuminance adjustment circuit 2 are shared, and the variable resistor VR3 is
Contactor B1 on the adjustment circuit 1 side and adjustment circuit 2
An adjusting means is provided that can be operated in conjunction with the side contactor B2 using the same adjusting knob.

Therefore, in the device configured in this way, each contactor B is adjusted in advance relative to the knob position of the variable device VR3 so that the illuminance of the lamps PL1 and PL2 adjusted by the respective adjustment circuits 1 and 2 is equal.
By adjusting the positions of lamps PL1 and B2, the illuminance can be adjusted using the knobs while always keeping the illuminance level of each lamp PL1 and PL2 equal. Note that this instrument lighting device is best used when the total load of each lamp PL1, PL2 is about 20W or more.

Effects As described above, regarding the instrument lighting device according to the present invention,
When using a pulse control type illuminance adjustment circuit and a variable resistance type illuminance adjustment circuit together in accordance with various instruments in automobile instrument panels, which are classified according to the presence or absence of noise caused by high-frequency signal components, it is necessary to The circuit configuration can be simplified by using a common variable resistor, and the illuminance of various instruments can be easily adjusted to the same level by simply operating the illuminance adjustment knob on the variable resistor. It has the excellent advantage of being able to

[Brief explanation of the drawing]

Fig. 1 shows a conventional illuminance adjustment circuit using a variable resistance type, Fig. 2 shows an illuminance adjustment circuit using a conventional pulse control method, and Fig. 3 shows an embodiment of an instrument lighting device according to the present invention. FIG. 3 is a diagram showing an illuminance adjustment circuit. PL1, PL2...Lamp, VR1, VR2, VR
3...Variable resistor, CONT...Control unit, B1, B2...Contact.

Claims (1)

[Scope of utility model registration request] A first illuminance adjustment circuit using a variable resistance type that adjusts the illumination intensity of the instrument lighting lamp and a second illuminance adjustment circuit using a pulse control method that adjusts the illuminance of the instrument illumination lamp are connected in parallel to the battery. At the same time, the variable resistor of the first illuminance adjustment circuit is shared with the variable resistor for pulse width adjustment in the second illuminance adjustment circuit, and the contact on the first adjustment circuit side and the An instrument lighting device configured by providing an adjustment means that can be operated in conjunction with a contactor on the side of a second adjustment circuit using the same adjustment knob.