JPS63246687A - Output detector for i.c. type device - Google Patents

Abstract

PURPOSE:To enable observation of a working waveform with naked eyes, by outputting emission brightness of a small LED lamp element with a photodiode as voltage to reduce phase change due to a power consumption. CONSTITUTION:Conductors 6 and 7 are connected to output terminals of a power source and a digital I.C. type device. When an output of the digital I.C. type device is at a high level in voltage, there is no emission as no current flows through a small LED lamp 1. As the voltage approaches zero with an output voltage moving to a low level, a voltage difference is caused between the conductors 6 and 7 almost equivalent to a power source voltage to let current flow through an LED and with the value thereof limited by an electric resistance 2, the LED emits light according to the current. On the other hand, an output of a photodiode or a phototransistor 9 of a detector is amplified with an amplification circuit 12 and inputted into an external equipment, for example, a CRT oscillograph to display an output waveform.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to Digicle I. C. Non-contact detection of light emitted from old lamps on circuit boards using similar products ■.

This invention relates to a detection device that can monitor and measure C1 class operations.

[Conventional technology]

Digital 1. conventionally incorporated into various circuits. C.

In order to monitor and measure the operation of a system, for example, contact one or more necessary points in the circuit connection, and monitor the waveforms at those points with a voltmeter or cathode ray tube oscilloscope (U11 constant). or those points K L
The method used was to connect an ED lamp poisonous bulb and emit light according to the voltage at that point, which was then visually observed.

[Problem that the invention seeks to solve]

However, in such a conventional method, unless it can be determined based on the overall operation, it is necessary to bring a contact point into contact with 812 points in the circuit and derive the voltage at that point to the outside. The above conventional LED lamp element is also the same in that sense, and the power consumption of the conventional LED lamp element is digital 1. C. In many cases, these cannot be ignored, and in order to simultaneously monitor multiple points, it is necessary to connect (solder) each point with a series resistor, and these can only be monitored visually.

Generally, digital 1. The waveform of C. type of operation is so fast that it is impossible to observe it with the naked eye.

Furthermore, depending on the circuit configuration, there is a problem in that it is necessary to monitor and measure the phase difference at multiple points and the correlation between the songs.

[Means for f = i to solve the problem] The present invention aims to solve such conventional problems.
By making the lamp element smaller, the luminance (intensity) of the light emitted by the lamp is reduced, but at the same time the power consumption is also drastically reduced. C. The load can be ignored as a similar load, and the aether resistance that should be connected in series can also be made small. However, since the luminescent door of such an LED lamp element is minute and inconvenient for visual inspection, some kind of detection device is required.

Therefore, the present inventor provided a photodiode or a phototransistor at the tip, and made it possible to observe and measure the detected light emission intensity of the LED lamp by outputting it as a voltage (or current).

That is, the present invention molds a small LEII lamp and a small aether resistance connected in series to it into one body, and
Connect the book's lead wires to the printed circuit board surface digital I. C. Connect between the output end of the digital I. C. 1.C, wherein the LED lamp has a photodiode or a phototransistor at its tip, and the light emission intensity of the LED lamp, which blinks in accordance with the sequential output voltage waveform, is observed as an electrical output in accordance with the light emission intensity.

This invention relates to output detection devices of the same type.

The invention will be explained below with reference to the figures.

The figure shows an embodiment of the detection device of the present invention.

In the figure, 1 is processed to make the LED operate, 3
It is a small LED lamp that emits light in the direction of , and is integrally molded with a small aether resistor 2 connected in series with it. The resistance value of 2 is determined by the power supply voltage of the intended circuit and the required current of the LED. 4 and 5 are thin wires connected to the LED and resistor, and are the same as the usual 1. C.

Gold wire may be used as well. 6 and 7 are connected to the gold wire 4.5 and are connected to the power supply and digital I. C. This is a conductive wire connected to the output end of the connector, which is mechanically strong and stable, and may be a plated copper wire. Reference numeral 8 denotes a transparent glass or plastic molded material that mechanically holds these, seals the inside, and allows the light emission 3 of the LED lamp to pass through.

If necessary, only the part that transmits the light emitted by the LED may be transparent, and the other parts may be opaque. It is preferable that these be small as a whole and flat in some cases, for example 6.
It is preferable that the left and right lengths are about 2 cm, except for 7, and the thickness of 8 is 11 or less.

Digital 1. When it is enclosed in a package of type C, the conductor 6.7 and the package 8 can be omitted.

The LED lamp element or the package containing it can be placed anywhere in a digital circuit, such as a digital I. C.
on the top of a similar package, or on the top of a digital I. C. The digital I. C. Connect between the output terminal of the type and the power supply.

This digital I. C. When the output of a similar device is at a high level as a voltage, the voltage is approximately equal to the power supply voltage.

That is, there is no voltage difference between the conducting wires 6 and 7, and no current flows through the LED, so it does not emit light. When the output voltage becomes low level and the voltage is close to zero, a voltage difference approximately equal to the power supply voltage is created between the conductors 6 and 7, and current flows through the LED, but its value is limited by the aether resistance 2, The LED emits light using this current. Depending on whether the LED emits light or not, the digital I.
C. The output waveforms of the following types are shown.

If the target digital I. C. Types are T, T, L
Or, if the digital I. C. Conductive wires 6 and 7 may be connected between the output terminal of the type and ground voltage (zero voltage of the power supply). In this case, when the output is at a high level, the current flows from the output terminal to "D", so the conductor connected to the output terminal is the opposite of the above case. The LED emits light when the output is at a high level, and does not emit light when the output is at a low level.

The detection device inputs the output of the photodiode or phototransistor 9 to an amplifier circuit through conductors 10 and 11, and connects the amplified output to an external device (for example, a cathode ray tube oscilloscope) through conductors 13 and 14 to display the output waveform.

The wavelength of light at the time of emission of light does not necessarily have to be in the visible light region. A photodiode or phototransistor with sensitivity characteristics suitable for the emission wavelength of the LED detects the emission and supplies it to the amplifier as an amount of electricity. Furthermore, although the photodiode or phototransistor 9 is located at the tip of the case 15 of the detection device, the periphery and upper part of the photodiode or phototransistor 9 is covered by the case, and the structure needs to be such that the lower part also blocks light incident from the side as much as possible. The power for the detection device may be supplied externally or may include a built-in battery.

〔Effect of the invention〕

According to the invention, a digital device is operated in a circuit.

For class C1, instead of contacting the external circuit and knowing its output and operation, it is easy to use a non-contact method while avoiding short circuits to unnecessary parts and using a method that minimizes state changes due to power consumption. I can do it. Even if a plurality of them are used at the same time, there is no risk of mutual interference occurring, and as a result, the mutual relationship between the plurality of points can be monitored and measured extremely easily.

Therefore, in a digital circuit system, the digital 1
．． For Class C, adjustments are made while monitoring the interrelationships of waveforms, and when there is an abnormality in the operation of the system, the waveforms and interrelationships are checked, and the current operation of important points is checked when necessary during operation. This makes it possible to carry out tasks much easier and more accurately than before.

[Brief explanation of drawings]

The figure shows an I.D. lamp having an LED lamp element of the present invention. C. FIG. 2 is an explanatory diagram showing an example of a type of output detection device. 1...LED lamp 2...Aether resistance 3...Light emission 4.5...
...Gold wire 6.7...Conductor wire 8...
...Package 9...Photodiode or phototransistor 10, 11.13.14...
...Conductor wire 12...Amplifier 15...Case

Claims (1)

[Claims] A small LED lamp and a small aether resistor connected in series are molded into one body, and the two lead wires at both ends are connected to the printed circuit board surface digital I. C. Connect between the output end of the digital I. C. The I.I. C.
type of output detection device.