JPH0422305Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a level display device that is installed in, for example, audio equipment and is suitable for displaying the level of a recording or playback signal in multiple levels.

<Prior art> Conventionally, as a level display device for audio equipment, etc., a plurality of display elements are arranged in an array, and depending on the level of input voltage, the display element corresponding to a low voltage level is displayed to a high voltage level. Some devices are configured to sequentially light up the elements. However, in such a level display device, in order to display the level of the input voltage in N stages (N is a natural number of 2 or more), N display elements are required. In order to perform display, the number of display elements must be increased, and the mounting space for the display elements becomes large, which poses a problem in that it becomes an obstacle to miniaturizing the device.

<Purpose of the invention> The present invention was made in view of the above points, and the purpose is to provide a level display device that uses a small number of display elements and is capable of highly accurate level display. do.

<Structure of the invention> In order to achieve the above-mentioned object, the level display device of the invention includes 2N first to second N level comparators. Each one input terminal of each of the level comparators is given a reference voltage that individually corresponds to each stage of the input voltage level, and each of the other input terminals is given a common input voltage. I am trying to make sure that it is given to me. Further, each of the output terminals of the first to Nth level comparators that compare the input voltages of the first to Nth levels with the corresponding reference voltages is equipped with a first
The input terminals of the N-th display elements are individually connected, and the input voltages of the levels from the (N+1) to the 2N-th stages are compared with the corresponding reference voltage.
1) to each of the output terminals of the second N-level comparators, the output terminals of the first to N-th display elements are individually connected, so that each of the display elements outputs the first to N-th level comparators. The level of the input voltage is displayed in 2N steps by lighting up one by one as the outputs of the (N+1) to 2N level comparators successively go to high level, and turning off the lights one after another as the outputs of the (N+1) to 2N level comparators successively go to high level. It is composed of

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram of an embodiment of the present invention. This level display device 1 has an input terminal 2
The level of the input voltage from
It is equipped with 10 level comparators A1 to A10. One input terminal of each of the level comparators A1 to A10 is supplied with a reference voltage divided by voltage dividing resistors R1 to R10 from the reference voltage generation circuit 3, and the other input terminal of each of the level comparators A1 to A10 is supplied with a reference voltage divided by voltage dividing resistors R1 to R10. , the input voltage from input terminal 2 is commonly applied. Each of the reference voltages of the first to tenth level comparators A1 to A10 corresponds to each stage of the input voltage level, and the first to tenth level comparators A
The voltage level of the reference voltage increases in the order of 1 to A10.

A resistor r1 is connected between the output terminals of the first level comparator A1 and the sixth level comparator A6,
A first light emitting diode L1 serving as a first display element is connected in series. This first light emitting diode L1
The input terminal of is connected to the output terminal of the first level comparator A1, and its output terminal is
Connected to the output terminal of the sixth level comparator A6.

Similarly, between the output terminals of the second level comparator A2 and the seventh level comparator A7, the third
Between the output terminals of the level comparator A3 and the eighth level comparator A8, between the output terminals of the fourth level comparator A4 and the ninth level comparator A9, and between the output terminals of the fifth level comparator A5 and the tenth level comparator A10. , resistance r2
and the second light emitting diode L2, the resistor r3 and the third light emitting diode L3, the resistor r4 and the fourth light emitting diode L4, and the resistor r5 and the fifth light emitting diode L5 are connected in series, respectively.

That is, the first to fifth level comparators A1
Each output terminal of ~A5 is connected to the first ~A5 as a display element.
The first to fifth light emitting diodes L1 are individually connected to the input terminals of the fifth light emitting diodes L1 to L5.
The output terminals of ~L5 are individually connected to the output terminals of the 6th to 10th level comparators A6 to A10.

In the level display device 1 of the present invention having the above configuration, as the input voltage level increases from the first to the tenth level, the first to tenth level comparators A1 to A10 are sequentially operated in this order. Becomes a high level. When the first to fifth level comparators A1 to A5 sequentially become high level, the first to fifth light emitting diodes L1 to L5, which are display elements, are driven and sequentially lighted. Furthermore, the input voltage level increases and the 6th to 10th level comparators A
When 6 to A10 become high level one after another, the first to fifth light emitting diodes L1 to L5 that are lit are turned off one after another because the potential difference between both terminals disappears.

FIGS. 2A to 2J are front views illustrating this state, and show how the first to fifth light emitting diodes L1 to L5 blink as the input voltage increases. In the figure, the state in which the first to fifth light emitting diodes L1 to L5 are turned off is indicated by diagonal lines.

Now, the input voltage level has increased and the first to fifth
As the stage level is reached, the first light emitting diode L1 to the fifth light emitting diode L5 change to the second light emitting diode L1 to the fifth light emitting diode L5.
Lights up sequentially as shown in Figures B to 2F,
Furthermore, as the level of the input voltage reaches the level of the 6th to 10th stage, the first light emitting diode L
1 to 5th light emitting diode L5 are shown in Fig. 2G~
The lights are turned off one after another as shown in FIG. 2J.

In this way, the level of the input voltage is increased to 10 by the five first to fifth light emitting diodes L1 to L5.
It is possible to display in stages, and the number of display elements can be halved compared to the conventional example. Therefore, it is possible to reduce the mounting space for the display element.

<Effects of the invention> As described above, according to the invention, in a level display device that displays the input voltage level in 2N steps (N is a natural number of 2 or more), 2N first to second N levels are displayed. Equipped with a comparator,
One input terminal of each of the level comparators is supplied with a reference voltage that individually corresponds to each stage of the input voltage level, and the other input terminal of each of the level comparators is supplied with the input voltage in common. to Nth
The input terminals of the first to Nth display elements each composed of a light emitting diode or the like are individually connected to each of the output terminals of the first to Nth level comparators that compare the input voltage of each level with a reference voltage. and the (N+1)th level that compares the input voltages at the levels from the (N+1)th to the 2Nth stage with the reference voltage.
The output terminals of the first to Nth display elements are individually connected to the respective output terminals of the second N level comparators, and the output terminals of the first to Nth level comparators are sequentially connected to the high level. As the output of the (N+1) to 2nd N level comparators sequentially becomes high level, the light turns on sequentially as the level of the input voltage increases. can be displayed in 2N stages, and the number of display elements can be halved compared to the conventional example, thereby making it possible to reduce the mounting space for display elements.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a plan view showing how a light emitting diode blinks as the input voltage changes. 1... Level display device, A1 to A10... 1st
~10th level comparator, L1~L5...1st
~Fifth light emitting diode.

Claims (1)

[Scope of claim for utility model registration] The level of the input voltage is set in 2N steps (N is 2
A level display device that displays a level in terms of a natural number (a natural number equal to or more than A reference voltage corresponding to the first to Nth stages is applied, and the input voltage is commonly applied to each of the other input terminals, and the input voltages at the levels from the first to the Nth stage are
The input terminals of the first to Nth display elements each configured of a light emitting diode or the like are individually connected to each of the output terminals of the first to Nth level comparators that are compared with the corresponding reference voltage, and the (N+1th) )
(N+1) to the 2N stage, which compares the input voltage at the level from the (N+1) to the 2N stage with the corresponding reference voltage.
The output terminals of the first to Nth display elements are individually connected to each output terminal of the level comparator, and each of the display elements is connected to each output terminal of the first to Nth level comparators as the outputs of the first to Nth level comparators sequentially become high level. The level display device sequentially turns on as the outputs of the (N+1) to 2N level comparators sequentially become high level.