JPS647434Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an indicator light that is attached to the display surface according to a map for each subject in a map-based display section of a monitoring panel for intensive load monitoring.

Conventionally, three indicator lights are installed as means for displaying three types of information, and contents are displayed by lighting each indicator light. A switching display is performed using a two-color indicator light. For two indicator lights, continuous lighting or flickering lighting may be combined to provide an indication. FIG. 1 shows an example of the above case, in which one end of the three indicator lamps L ₁ to _{L 3} is commonly connected to serve as the power supply terminal 6, and the other end of each indicator lamp L ₁ to _{L 3} is connected to the power terminal 6, respectively. These are signal terminals 7-9. Therefore, in such a case, a large display area is required, and the wiring requires three signal lines to the signal terminals 7 to 9 and a crossover wiring of the power line to the power supply terminal 6, resulting in a large number of wiring lines. There is a problem with becoming. FIG. 2 shows the above case. For example, the signal terminal 10 is used to light up the indicator lamp _L4 in green, the signal terminal 11 is used to light it in red,
Further, a flicker signal is applied to the signal terminal 11 to cause a red flicker to be lit. 6 is a power terminal. In such a case, the color can be switched and displayed for different uses, but there are two signal lines, which not only takes time and effort for wiring, but also requires two systems of control units (driver units) to generate signals. Further, in the above case, there are two display lamps, but the signal lines and the like are the same as above.

The present invention has been proposed in view of the above-mentioned points, and provides an indicator light that can provide three types of indications by wiring a power supply and one control signal line in one indicator lamp body. The purpose is to

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 3 shows a specific circuit diagram of the indicator light main body 4 formed in one package, in which 1 is a power terminal for power supply, 2 is a common terminal for grounding, and 3 is a common terminal for grounding.
is a signal terminal for inputting a control signal, and has three terminals, and is provided with light emitting diodes LED ₁ and LED ₂ which are display elements that emit light in two different colors. resistance
A series circuit of R ₁ and a light emitting diode LED ₁ that emits green light, and a series circuit of a resistor R ₂ and a light emitting diode LED ₂ that emits red light are connected between the power supply terminal 1 and the common terminal 2, respectively. light emitting diode
The collector and emitter of the transistor Q ₁ are connected to both ends of the LED ₂ , and the base is connected to the anode of the light emitting diode LED ₁ via a resistor R ₃ , and further connected to the signal terminal 3. A control circuit is composed of the resistors R ₁ to R ₃ and the transistor Q ₁ . by the way,
The display light main body 4 is used on the display surface of the monitoring panel, and the display contents are as follows, for example. Light emitting diode LED ₁ lights up (green light)
If the motor is stopped, it will be displayed.
When the other light emitting diode LED ₂ lights up (red light), the operating status of the motor is displayed. Furthermore, in the case of flicker lighting in which both the light emitting diodes LED ₁ and LED ₂ are turned on alternately, a failure of the motor circuit is displayed. Reference numeral 12 denotes a control signal generation circuit that generates control signals such as H level, L level, and intermittent pulses, and the control signal is inputted to the signal terminal 3 of the indicator lamp body ₄ via the driver transistor Q2. There is. The wiring is as follows. First, connect the power terminal 1 and the common terminal 2 between the plurality of indicator lamp bodies 4, and finally connect the control signal generation circuit 12.
Wire the output section of the external driver circuit including the transistor _Q2 and the signal terminal 3.

Thus, when the control signal generating circuit 12 outputs an L level signal, the signal terminal 3 is at the H level, and therefore the light emitting diode LED ₁ lights up in green. At this time, the forward voltage drop of light emitting diode LED ₁ is approximately 2V, so the transistor
Q ₁ is turned on, and light-emitting diode LED ₂ does not light up because only a voltage of about 0.1V is applied. next,
When an H-level signal is output from the control signal generation circuit 12, the transistor _Q2 is turned on, so that the light emitting diode _LED1 does not light up because only a voltage of about 0.1V is applied to it. On the other hand, transistor
Since Q ₁ is in the off state, the light emitting diode LED ₂
will be lit red. Furthermore, when the control signal generating circuit 12 outputs an intermittent pulse, both the light emitting diodes LED ₁ and LED ₂ are turned on alternately depending on the H level and L level of the pulse.

Next, the transient state of rising and falling of the signal input to the signal terminal 3 will be explained. First, when the signal terminal 3 changes from L level to H level, the potential of the anode of the light emitting diode LED ₁ and the base of the transistor Q ₁ rises, but the forward voltage drop of the light emitting diode LED ₁ is about 2V.
The voltage between the base and emitter that turns on transistor _Q1 is approximately 0.7V, so as the voltage increases,
Transistor Q ₁ always turns on first before light-emitting diode LED ₁ turns on. Therefore, the other light emitting diode LED ₂ , which was on, turns off before the light emitting diode LED ₁ turns on, and in this state, both light emitting diodes LED ₁ and LED ₂ are turned off.
In other words, the lights are off. Then, when the voltage at the signal terminal 3 further increases and becomes higher than 2V, the light emitting diode LED ₁ turns on and lights up. At this time, the transistor _Q1 is on, so the light emitting diode _LED2 is still off.

Next, when the potential of the signal terminal 3 changes from the H level to the L level, the operation is as follows. In other words, the light emitting diode LED ₁ is on and lighting up, but when the potential drops below 2V, the light emitting diode LED ₁ turns off before the transistor Q ₁ turns off.
turns off and goes out. At this time, transistor Q ₁
Since there is more than 0.7V between the base and emitter of Q1, transistor _Q1 is on and the light emitting diode
Turning off LED ₂ . When the potential of the signal terminal 3 further drops, the transistor _Q1 will eventually turn off and the light emitting diode _LED2 will turn on and light up.

In this way, both light emitting diodes LED ₁ , when the signal terminal 3 changes from L level to H level and from H level to L level,
LED ₂ is never on at the same time, making the display easy to read when switching between displays.

FIG. 4 shows another embodiment in which the circuit configuration is changed by adding a transistor _Q3 to reduce the signal current. Now, if there is no input to signal terminal 3 (H level), transistor Q ₃
is off and light emitting diode LED ₂ does not light up.
Green light emitting diode LED ₁ lights up. Next, when an L level signal is input to signal terminal 3, transistor Q ₃ turns on, so light emitting diode LED ₂
lights up red. At this time, this light emitting diode
Transistor Q ₁ for forward voltage drop of LED ₂
is on, so light emitting diode LED ₁ does not light up.

As described above, the present invention has a power terminal to which power is applied, a common terminal which serves as a ground terminal, and a signal terminal to which three types of control signals, namely an H level signal, an L level signal, and an intermittent pulse, are input. The indicator light body is formed from one package in which two light emitting diodes that emit light and display different colors are installed inside the indicator light body, and the two light emitting diodes are arranged in the indicator light body according to the type of signal. Since this device is equipped with a control circuit that controls blinking, the 3 signals input to the signal terminal
It is possible to perform three types of display by lighting only one light emitting diode, lighting only the other light emitting diode, or lighting both light emitting diodes alternately and intermittently depending on the control signal of the type. Moreover, since one package forms the indicator lamp body, the area can be arranged in the same way as one light emitting diode, making the display unit compact.In addition, the wiring for the display elements that display three displays can also be used to signal Wiring to the terminal is possible using a single dedicated line, which makes the work easier and reduces the possibility of incorrect wiring, which has the advantage of requiring less space and materials for wiring. Furthermore, two series circuits including a resistor whose one end is connected to a power supply terminal, and a light emitting diode whose cathode is connected to a common terminal,
The above control is performed using a transistor whose collector is connected to the connection point between the resistor and the light emitting diode in one series circuit, the base is connected to the connection point between the resistor and the light emitting diode in the other series circuit, and the emitter is connected to the common terminal. Since it is a component of the circuit, when the signal terminal changes from L level to H level during the transient state of rising and falling signals input to the signal terminal, the anode of one light emitting diode and the transistor Although the potential of the base increases, the forward voltage drop of the light emitting diode is about 2V
The voltage between the base and emitter that turns on the transistor is about 0.7V, so as the voltage increases, the transistor always turns on first before the light emitting diode turns on. Therefore,
The other light-emitting diode that was on turns off before the other light-emitting diode turns on, and in this state both light-emitting diodes are off, in other words, the light is off, and the voltage at the signal terminal further increases.
When the voltage rises above 2V, one of the light emitting diodes turns on and lights up. At this time, the transistor is on, so the light emitting diode is still off. Next, when the potential of the signal terminal goes from H level to L level, the light emitting diode turns on and lights up, but if the potential drops below 2V, one of the light emitting diodes turns off before the transistor turns off. The light turns off and goes out.At this time, the voltage between the base and emitter of the transistor is 0.7V or more, so the transistor is on, turning off the other light emitting diode, and as the potential of the signal terminal drops further, the transistor will eventually turn off. In this way, both light emitting diodes are turned on at the same time when the signal terminal goes from L level to H level and when it goes from H level to L level. This is absolutely not the case, and the effect is that the display can be made easier to see when switching the display.
Further, since it is possible to alternately display the switching of the light emitting diodes with one transistor without lighting both light emitting diodes at the same time, it is possible to improve assembly efficiency and reduce costs. In addition, when the indicator lights of the present invention are used in a monitoring panel for map-based display, since maps are never the same for each subject, dozens of indicator lights are installed individually, and a circuit for controlling the indicator lights is installed. Although the wiring work must be done manually as standard harnesses cannot be used, the use of this indicator light reduces the number of wires and has significant advantages in terms of cost, quality, etc.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a conventional example, Fig. 2 is a circuit diagram of another conventional example, Fig. 3 is a specific circuit diagram of an embodiment of the present invention, and Fig. 4 is a specific circuit diagram of another embodiment of the same. It is. 1 is a power terminal, 2 is a common terminal, 3 is a signal terminal,
4 is the indicator light body, R ₁ , R ₂ are resistors, LED ₁ , LED ₂
indicates a light emitting diode, and _Q1 indicates a transistor.

Claims (1)

[Scope of utility model registration request] It has a power terminal to which power is applied, a common terminal which serves as a ground terminal, and a signal terminal to which three types of control signals, H level signal, L level signal, and intermittent pulse, are input. An indicator light main body is formed from one package provided with two light emitting diodes that emit light to display the light, and a control circuit is provided in the indicator light main body to control the blinking of the two light emitting diodes according to the type of signal. , two series circuits consisting of a resistor whose one end is connected to a power supply terminal, and a light emitting diode whose cathode is connected to a common terminal,
The above control is performed using a transistor whose collector is connected to the connection point between the resistor and the light emitting diode in one series circuit, the base is connected to the connection point between the resistor and the light emitting diode in the other series circuit, and the emitter is connected to the common terminal. An indicator light consisting of a circuit.