JPH0741634Y2 - Dimmer circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a dimmer circuit, and more particularly to a dimmer circuit with improved operability and reliability.

(Prior Art) The dimmer function of increasing or decreasing the screen brightness of a display device that displays characters or images according to the ambient brightness is widely adopted in a liquid crystal display device of an in-vehicle audio system and the like.

Conventionally, ON / OFF control of this type of dimmer function is performed by a user's key operation.

(Problems to be Solved by the Invention) As described above, the ON / OFF control of the conventional dimmer function is performed by the user's manual operation.

However, in recent years, with the system upgrade of audio systems, the number of constituent units having a display device for displaying respective operation information and the like has been increasing. In such a system with a large number of constituent system units, in order to operate the dimmer function, the user must turn on the dimmer switch of each unit, and the operation becomes complicated especially in the car audio system. Therefore, there is a problem in terms of safe driving.

Therefore, an object of the present invention is to provide a dimmer circuit that is easy to operate and highly convenient.

(Means for Solving the Problems) In order to solve the above problems, a dimmer circuit according to the present invention includes a plurality of units each having a display unit having a dimmer function, and one unit among the plurality of units. A dimmer switch that is provided and outputs a first instruction signal for turning on the dimmer function of the display section of the unit, and a small lamp switch that outputs a second instruction signal for turning on a small lamp of the vehicle Receiving the first instruction signal and the second instruction signal, the second instruction signal
And a logic circuit for sending a dimmer signal to the display units of the plurality of units by using the instruction signal of 1) as a priority criterion.

(Operation) In this invention, the dimmer switch is provided only for a plurality of units each having a display section having a dimmer function.
Only one is provided to simplify the dimmer operation, and the dimmer function operation is controlled using the "ON" information of the small lamp switch as a priority judgment parameter, so a reliable dimmer function that matches the actual ambient environment conditions can be obtained.

(Example) Next, this invention is demonstrated, referring drawings.

FIG. 1 is a block diagram showing an embodiment of a dimmer circuit according to the present invention.

In this embodiment, the system configuration unit includes a cassette tuner unit 1 having a tape reproducing function for reproducing a cassette tape and a tuner function for selecting a desired station frequency from a broadcasting station frequency radio signal received by an antenna ANT, and a compact disc. An amplifier that receives a signal from the CD player 2 that reproduces (CD), a signal from the cassette tuner 1, and a signal from the CD player 2 via the cassette tuner 1, performs equalizer processing, amplification processing, and the like, and sends it to the speakers 5A and 5B. Part 3
Composed of and.

Each unit (cassette tuner 1, CD player 2, amplifier 3) is used to display the operating status (tape counter of cassette tape, reception tuning frequency, CD counter, track number, spectrum, etc.). Display units 1A, 2A, 3A such as a liquid crystal television are provided. As described above, the display units 1A, 2A, 3A are adjusted to a brightness that is easy to see according to the ambient brightness by the dimmer function.

In this device, unlike the conventional one, there is one dimmer switch 5 for turning on the dimmer function (one unit).
It is provided only in, and the brightness of the display portions 1A, 2A, 3B of all units is adjusted by turning on the dimmer switch 5.

In other words, in a bright environment such as daytime, the brightness of the display unit is increased to provide a bright display, but in a dark environment such as at night, the brightness is reduced and the display is adapted to the user's visibility as a slightly dark display. I am letting you. Therefore, the dimmer function of all the units can be controlled by operating one dimmer switch.

Further, the dimmer function is configured to perform ON control in response to a lighting operation of the small lamp of the vehicle (ON of the SL switch 6). At this time, the dimmer function is activated by turning on the small lamp and turning on the dimmer switch, but in the present invention, the dimmer function is operated by giving priority to the small lamp lighting operation.

That is, a small lamp lighting switch (SL switch)
When 6 is turned on, the logic circuit 7 turns the SL switch 6
Is received as the priority parameter of the determination standard, the dimmer signal S _D is transmitted, and the brightness in the display units 1A, 2A, 3A of each unit is reduced. Of course, SL switch 6 is OF
In the case of F, if the dimmer switch 5 is turned on, the logic circuit 7 supplies the dimmer signal S _D to the display unit, but SL
As long as switch 6 is "ON", dimmer switch 5
The output of the dimmer signal S _D does not stop even if is set to “OFF”.
On the other hand, when both the dimmer switch 5 and the SL switch 6 are in the "ON" state, the dimmer function remains in operation even if the SL switch 6 is turned "OFF". Also, set SL switch 6 to "ON".
To "OFF", the dimmer function is set according to the state of the dimmer switch set by the user.

(Effect of device) As described above, the dimmer circuit according to this device is
Only one dimmer switch for instructing dimmer operation for multiple units each having a display with a dimmer function is installed, and the dimmer function operation is controlled using "ON" information of the small lamp switch as a priority judgment parameter. Therefore, not only is the dimmer operation extremely simple, but a reliable dimmer function that matches the actual ambient environment conditions can be obtained. Therefore, when this invention is applied to a vehicle audio amplifier, more remarkable effects can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a dimmer circuit according to the present invention. 1 ... Cassette tuner, 2 ... CD player, 3 ... Amplifier, 4A, 4B ... Speaker, 5 ... Dimmer switch,
6 ... Small lamp switch, 7 ... Logic circuit.

Claims (1)

[Scope of utility model registration request] 1. A plurality of units each having a display unit having a dimmer function, and a first unit provided in one unit of the plurality of units for turning on the dimmer function of the display unit of the unit. A dimmer switch that outputs a second instruction signal for turning on a small lamp of a vehicle, a second dimmer switch that outputs a second instruction signal for lighting a small lamp of a vehicle, and a second instruction signal that receives the first instruction signal and the second instruction signal.
And a logic circuit for sending a dimmer signal to the display units of the plurality of units by using the instruction signal of 1. as a priority criterion.