JPH0142854B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a lighting control device for an automobile. (Prior Art) Automobiles are provided with lighting members to make it easier to see devices such as radios and speedometers arranged inside the vehicle at night. Such lighting members are generally turned on when a light switch is turned on, and the luminous intensity can be adjusted using an illumination controller depending on the intensity of external light. On the other hand,
Among the above-mentioned devices, there is a known technique for illuminating instrument panels that use liquid crystal displays regardless of day or night to ensure visibility. For example, as described in Japanese Unexamined Patent Publication No. 57-7732, regarding lighting means for liquid crystal displays, the lighting conditions include logic regarding the opening and closing of the ignition switch and light switch, so that even when the light switch is turned off during daytime driving, the lighting There is a technique in which the device is operated at maximum luminous intensity, and when the night light switch is turned on, the luminous intensity is adjusted by a duty-controlled luminous intensity setting device to provide illumination. By the way, there is a radio lighting means that turns on only at night, that is, only when the light switch is on.
If there is an illumination member that is turned on both day and night, that is, a radio frequency display means, if the illumination controller of the radio illumination means is used as it is to adjust the brightness of the frequency display means, the output of the illumination controller will be zero at night. If the radio is turned off, it is determined that the light switch is turned off, that is, it is determined that it is daytime, and the frequency display section becomes as bright at night as it is during the day. (Object of the Invention) The present invention allows the frequency display means of the radio to always display the frequency in a state of low luminance if the light switch is on even when the illumination means of the radio is turned off. It enables lighting. (Structure of the Invention) In the present invention, a radio illumination means whose brightness is adjusted by an illumination controller, a radio frequency display means whose brightness is adjusted by a daimer switch, and a daimer switch control means are provided, and the illumination controller When outputting a light intensity adjustment signal, a low light intensity signal is output to the daymer switch, and a high light intensity signal is output to the daymer switch only when the radio switch is on and the light switch is off. (Example) Hereinafter, an example of the present invention will be described based on the drawings. In the lighting circuit configuration shown in FIG. 1, 1 is a light switch, 2 is a radio switch, 3 is a radio illumination means, and 4 is a radio frequency display means using a light emitting diode. Light switch 1 is a car headlight,
It controls the lighting of small lights, etc., and sends output signals to the illumination controller 5 and sub-controller 6. The illumination controller 5 outputs a light intensity adjustment signal having a pulse width corresponding to the resistance set by operating the dimming volume to the TNS (automobile tail number side) lamp 7 and the sub-controller 6. The sub-controller 6 includes first and second transistors 8 and 9 forming a Darlington connection circuit, resistors 10, 11 and 12 that determine the bias value of this Darlington connection circuit, and an integral of the current flowing to the base of the first transistor 8. circuit 13
, an oversaturation prevention circuit 14, reverse voltage prevention diodes 15 and 16, and an output voltage stabilization capacitor 1
7. The output voltage V ₂ of the sub-controller 6 is the output voltage V ₁ of the illumination controller 5.
When is b to a (a is the battery voltage), then b to a. This b is determined by the values of the resistors 10, 11, and 12, and is set so that when V ₁ =0, V ₂ =b. The signal from the sub-controller 6 is output to a transistor 18 that controls the on/off of electricity to the radio illumination means 3, and is also output to a control switch (transistor )20. In this case, the transistor 18 operates by receiving the output from the sub-controller 6 at a voltage division ratio set by the resistors 21 and 22, and when the output of the illumination controller 5 is 0V, that is, the output bV of the sub-controller 6 It turns off when
The threshold value c is set so that the illumination controller 5 turns on when its output is higher than 0V. On the other hand, the control switch 20 receives the output from the sub-controller 6 at a voltage division ratio set by the resistors 23 and 24, and is turned on when the light switch 1 is on, regardless of the presence or absence of the output from the illumination controller 5. The threshold value d is set as follows. The frequency display means 4 displays a frequency using a plurality of light emitting diodes 25 for one number, and receives a signal from the radio switch 2 and uses a switch (transistor) according to a signal from the display controller 26. Lights up when 27 is turned on or off.
It is starting to disappear. The above-mentioned daymer switch 19 is connected to the resistor 2.
8, 28, . In the above circuit configuration, when the light switch 1 is on, the TNS lamp 7 and the like are lit with a luminous intensity corresponding to the luminous intensity adjustment signal from the illumination controller 5. Furthermore, the radio illumination means 3 is turned on at a luminous intensity corresponding to the luminous intensity adjustment signal (pulse) by a DC voltage signal from the sub-controller 6 which is also controlled by the luminous intensity adjustment signal (pulse).
In this case, when the output of the illumination controller 5 is 0V, the transistor 18 is turned off and the radio illumination means 3 is turned off. On the other hand, the frequency display means 4
When it is on, it lights up in response to a signal from the display controller 26. When the light switch 1 is on, that is, when the outside light is weak such as at night, the control switch 20 is turned on by the output from the sub-controller 6, regardless of whether the brightness adjustment signal from the illumination controller 5 is 0V or a higher voltage value. An off signal, that is, a low luminous intensity signal is then sent to the dimmer switch 19, and the frequency display means 4 lights up at a low luminous intensity corresponding to the size of the resistor 28. On the other hand, when the light switch 1 is off, that is, when the outside light is strong such as during the day or night, there is no output from the sub-controller 6, so the control switch 20 is turned off, and an on signal is sent to the daymer switch 19, that is, when the light intensity is A high signal is sent,
The frequency display means 4 is caused by the current flowing from the radio switch 2 to the daymer switch 19 side.
It will stay lit even at high luminous intensity. Therefore, even if the output of the illumination controller 5 is set to zero and the illumination by the TNS lamp 7 or the radio illumination means 3 is cut off, for example at night when the luminous intensity of the frequency display means 4 is low, the control switch 20 does not switch from the light switch 1 to the sub It is determined that it is a dimmer based on the signal outputted through the controller 6, and the dimmer switch 19 maintains the low luminous intensity state of the frequency display means 4. Then, only when the light switch 1 is turned off, the frequency display means 4 becomes high in luminous intensity, and appropriate illumination according to day or night is performed. Further, since the illumination signal on the radio side is converted into a DC signal by the sub-controller 6, noise is not imparted to the radio body, and furthermore, only one harness is required to extend from the light switch 1 side to the radio side. Incidentally, the on/off of the light switch 1 and the radio switch 2, the output voltages V ₁ and V 2 of the illumination controller 5 and the sub-controller ₆ , and the transistor 18
and the base input voltages of the control switch 20 V ₃ , V ₄ ,
Output signal of control switch 20, radio illumination means 3
The relationship between the luminous intensity of the frequency display means 4 and the luminous intensity of the frequency display means 4 is as shown in the following table.

[Table] Also, the above example is a case where the illumination controller emits a duty control pulse signal, but
When the output of the illumination controller is a DC type, the sub-controller 30 can be replaced with one using diodes 31, 32 and a resistor 33, as shown in FIG. Note that the terminals t ₁ to _{t 3} in FIG. 2 correspond to the terminals t ₁ to _{t 3} in FIG. 1. Furthermore, although the above embodiment uses a transistor as the dimmer switch, other relay switches may be used, and the resistors 28, 28, . A variable resistance linked to the volume,
The luminous intensity may be changed linearly. (Effects of the Invention) According to the present invention, if the light switch is on, even if the radio illumination is turned off by the illumination controller, the frequency display means of the radio will dim the light intensity to a low state because the daymer switch is on. You can keep it on and get proper lighting.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a circuit diagram of a lighting control device for an automobile, and FIG. 2 is a circuit diagram showing another embodiment of the sub-controller surrounded by the two-dot chain line in FIG. 1. be. 1... Light switch, 2... Radio switch, 3... Radio lighting means, 4... Frequency display means, 5... Illumination controller, 6, 30... Sub controller, 19... Daymer switch, 2
0...Control switch.

Claims (1)

[Claims] 1 A radio illumination means arranged in the vehicle interior and whose brightness is adjusted by an illumination controller, a frequency display means which displays the frequency of the radio and whose brightness is adjusted by a daymer switch, and a radio on/off control. A light switch that controls the lighting of car lights, a light switch that outputs a low light intensity signal to the daymer switch when the illumination controller outputs a light intensity adjustment signal, and when the radio switch is on and the light switch is off. 1. A lighting control device for an automobile, comprising: control means for outputting a signal indicating a high luminous intensity to a dimer switch.