JPS645206Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bar graph type liquid level display device, and particularly to a display mechanism for a low level display segment suitable for displaying a low level alarm. In recent years, so-called bar graph type display devices using LEDs and fluorescent display tubes have been put into practical use for displaying measured quantities such as vehicle running speed.

Compared to the conventional rotation instruction method using a pointer, it is detected and controlled purely electrically and can be easily displayed in color, making it possible to display information with extremely high accuracy and good visibility. It has excellent responsiveness that follows changes without delay.

Such a bar graph type display device is also applied to liquid volume display, and a stepwise display using a plurality of segments has been put into practical use as a general form.

In particular, when displaying the liquid level, a function is required to notify the observer of the need for replenishment due to a drop in the liquid level, but generally speaking, as shown in Figure 1, the liquid level is at the alarm point (hereinafter referred to as E point). ), the low-volume range segments a and b may be flashed, or the segments a and b may be colored red, for example, in a different color from the other normal-volume range segments, to warn of a drop in fluid volume. There is.

However, in this display device, when the liquid volume corresponding to the normal volume range segment c is measured, it is displayed in a form that includes everything below the above segment c, that is, the low volume range segments a and b. Even when an alarm was issued due to a drop in the liquid level, it was visually recognized as a mere display of a decrease in the liquid level, and the difference from normal conditions was extremely unclear, and the alerting effect to the observer could not be said to be sufficient.

The present invention is configured so that the low-volume segment is displayed for the first time at the time of the alarm when the liquid level decreases below point E, thereby clarifying the difference from the normal state and increasing the alerting effect to the observer. It is intended to provide a graphical display device.

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 2 shows a diagram of one detection control circuit for obtaining the alarm display form according to the present invention.
Reference numeral 1 denotes a liquid level sensor, which is installed in a liquid tank, for example, and consists of a float and a sliding resistor that floats in response to increases and decreases in liquid level, and outputs a detection signal of a DC voltage level corresponding to the liquid level. 2 is a comparator that sets a plurality of different stepwise reference levels and obtains multistage outputs by comparison with the input level. 3 is a drive circuit that operates the display 4 in response to the output from the comparator 2; Reference numeral 5 denotes a gate circuit that allows the drive circuit 3 to control the low-volume range outputs a and b of the comparator 2 to pass through, and is configured to enter a pass state when the comparator 2 detects an input below the alarm level. The display 4 has a bar graph shape in which display segments such as LEDs are arranged in a band shape, as shown in FIG. 3, for example, and displays the detected liquid amount in stages.

If the liquid level is now below point E, the output of the liquid level sensor 1 is input to the comparator 2 as a correspondingly high level. In the comparator 2, all comparison outputs below c corresponding to the reference level below the detection level become High level and are applied to the drive circuit 3. Here, since the detection level input to comparator 2 is higher than the alarm level corresponding to point E,
The gate circuit 5 is in a cut-off state, and the comparison outputs a and b at the low level are not applied to the drive circuit 3, so the display 4 indicates that the segment above point E is not present as shown in FIG. 3a. In addition to displaying the liquid level, the low-volume range segments 4a and 4b remain hidden.If the liquid level exceeds point E, the segments corresponding to the liquid level are displayed. The display amount is displayed in stages.

When the liquid level drops to the alarm level, all segments above point E are hidden, but in this case, as shown in Figure 3b, the low volume area segments 4a and 4b placed below point E are hidden. It emits a different color, for example red, from the segment above point E, and exhibits a warning effect that is completely different from simply indicating a decrease in liquid volume, and creates a very clear difference from normal conditions in attracting the observer's attention. You can make it come out.

Further, by flashing the symbol marks M arranged in parallel, an even more appealing effect can be obtained, and the danger of inoperability due to a delay in refueling can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view of the display form of a conventional example of a bar graph type liquid level display device, FIG. 2 is a block diagram showing an example of a circuit of the display device according to the present invention, and FIG. 3 is a display form of the same device. FIG. 1...Liquid level sensor, 2...Comparator, 3...Drive circuit, 4...Display device, 4a, 4b...Low volume range segment.

Claims (1)

[Scope of utility model registration request] In a bar graph type display device that displays the liquid level step by step using the display amount of multiple segments arranged in a strip, there is a liquid level sensor that outputs a detection signal of a DC voltage level corresponding to the liquid level, and a liquid level sensor that outputs a detection signal of a DC voltage level corresponding to the liquid level. A comparator that compares the detected signal with multiple different stepwise reference levels and outputs a multistage output signal, and a plurality of display segments arranged in a bar graph type display strip corresponding to the output signal of this comparator. A drive circuit for displaying and controlling the passage of an output signal corresponding to a lower region to be alarmed among the comparator outputs,
A liquid level alarm display device comprising a gate circuit that blocks an output signal corresponding to the lower region above the alarm region and maintains a display segment of the alarm region in a bar graph type display in a non-display state. .