JPS5929265Y2 - status display device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement in a status display device.

Conventionally, status display devices typically display one rung in correspondence with one input signal.

FIG. 1 shows a typical conventional circuit. Click the button I on Figure 1.
A, IB... are input signals, 5A.

5B... is a lamp driver, 6A, 6B... are display lamps, and 7 is a power supply bus.

Since there is a one-to-one correspondence between the input signal and the lamp, it is easy to visually check which signal is being input by the lit lamp.

However, if the number of display points increases, the number of lamps must be increased by that amount, which may lead to problems such as downsizing of the display device, resulting in insufficient space.

Therefore, there is a circuit shown in FIG. 2 as a method of displaying a plurality of input signals using the same lamp.

To simplify the explanation, a case where one lamp corresponds to two human input signals will be explained.

In FIG. 2, 2A, 2B, . . . are input signals 4A independent of IA, IB, .

4B... is an OR circuit.

According to the circuit shown in FIG. 2, two different types of input signals can be displayed with one lamp, but it is necessary to use another method to determine which input signal caused the lamp to light up.

An example of this other method is the method shown in FIG.

In Figure 3, IA, IB... and 2A, 2B...
. is the same as the input signal in FIG.

8-1.8-2 is an OR circuit, 9-1.9-2 is a lamp driver, and 10-1.10-2 is a lamp.

The input signals IA, IB... are connected to the first group, 2A, 2A...
Assuming that is the input signal of the second group, the lamp 10-1 lights up when there is a signal of the first group, and the lamp 10-2 lights up when there is a signal of the second group. It is possible to determine which signal is being input by the combination of lamps.

However, when there is a single input signal, it can be distinguished by displaying the above combination, but when two or more input signals are present at the same time, and the input signals of the first group and the second group overlap, it becomes impossible to distinguish. The combination method alone is not enough;
In addition to this, a priority circuit or a sequential circuit is required, and the effect of reducing the number of lamps cannot be obtained.

The present invention was devised in view of this point, and allows multiple input signals to be displayed with a single lamp by simply adding a simple circuit.Moreover, it is possible to display any number of input signals without the need for a combination display as shown in Figure 3. The present invention provides a status display device that makes it possible to determine whether a lamp is lit based on an input signal.

An embodiment of the present invention is shown in FIG.

Components with the same numbers as above in FIG. 4 have the same or equivalent functions.

In FIG. 4, for ease of explanation, an example will be described in which one lamp corresponds to two input signals.

AND circuit 3 controlled by input condition switching circuit 11
The output of A-1s3A 2 13B 1,... is 4A.

The lamps 5A, 5B, . . . are turned on by the lamp drivers 5A, 5B, . . . through the OR circuits 4B, .

Here, an example of the output form of the input condition switching circuit 11 is shown in FIG.

FIG. 5 shows a changeover switch with three positions rclrlJ "2".

In Fig. 5, when the position is "1", the input signal of the first group is valid and the input signal of the second group is invalid.
tl//, M circuit 3A-193A as mouth=ゝゝ0〃
-2... is controlled.

In addition, in position "2", control is performed so that only the input signal of the second group is valid, and in position rCJ, the input signal of the first group and the second group are controlled to be valid.
AND circuit 3 A r so that both groups are effective
t 3 A 2... is controlled.

When this input condition switching circuit 11 is normally set to the "C" position, each lamp is turned on by ORing the input signals of the first group and the second group.

When individual signal states are required, switching to the "1" or "2" position will light only the lamp corresponding to the input signal, making it possible to easily distinguish the signals.

In this explanation, a circuit in which one lamp corresponds to two input signals has been explained, but even in a circuit in which one lamp corresponds to three or more input signals, the input condition switching circuit 11
It goes without saying that this can be easily applied by adding a position in which only input signals of which group are valid and increasing the number of AND gates 3A-1, 3A-2, . . . by that amount.

Further, the input condition switching circuit 11 has been described as a changeover switch, but it has a "C" position and a "1" position.

The switch is not limited to a selector switch as long as it has a function equivalent to the "2" position.

This invention can be modified and implemented in various ways without changing the gist.

As described above, according to the present invention, by providing an input condition switching circuit in the lamp display circuit, it is possible to display multiple input signals with one lamp, and it is possible to easily determine which signal caused the lamp to turn on. A display device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the basic form of a conventional display device, FIG. 2 is a diagram showing an example of a conventional combination display circuit, FIG. 3 is a diagram showing its auxiliary circuit, and FIG. 4 is an implementation of the present invention. A circuit diagram showing an example, FIG. 5, is a functional diagram of the input condition switching circuit. 1A, IB, IC, 2A, 2B, 2C...input signal,
3 A-1, 3A -2, 3B -t, 3 B -
23C-1, 3C-2...AND circuit, 4A, 4B. 4C, 8-1, 8-2...OR circuit, 5A, 5B. 5C, 9-1, 9-2... Lamp driver, 6A. 5B, 6C, 10-1, 10-2... Indication lamp, 7
...Power bus, 11...Input condition switching circuit.

Claims (1)

[Scope of utility model registration request] An input condition switching circuit that has n output terminals (where n is an integer of 2 or more) and generates an output signal from each of the n output terminals corresponding to a switching condition position, and an output of this input condition switching circuit. 1 for every number (n) equal to the number of terminals
Status signals divided into m groups (where m is an integer of 2 or more) are input to one input terminal, and output signals output from each output terminal of the input condition switching circuit are input to one input terminal. nXm AND circuits that are input to other input terminals and take the logical product of two input signals; m OR circuits that are provided for each group and take the logical sum of the outputs of the AND circuits in the group; A status display device comprising m display elements that are lit according to the output of the OR circuit.