JPS5932051B2 - Polarity determination device for polarized capacitors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polarity determining device for a polar capacitor, and more particularly to a polarity determining device for a polar capacitor that determines the polarity using two different methods.

Traditionally, the polarity of polarized capacitors has been determined by detecting the polarity display printed on the outside of the capacitor, or by detecting the length of the lead wire for capacitors whose lead wire lengths differ depending on the polarity. A variety of devices are used, including methods to do so.

Incidentally, such a polarity determining device is provided as a part of a machine for taping capacitors, and is used to align the polarities in the same direction when taping capacitors.

These taped capacitors are automatically incorporated into printed circuit boards along with other electronic components to form the electrical circuits of various products.Recently, with the reduction in product defects, high accuracy is required for polarity determination. It's starting to happen.

However, even if various polarity discrimination devices are improved, it is very difficult to increase the discrimination accuracy beyond a certain value, although there are differences depending on the individual devices.

Therefore, in order to improve these drawbacks, a method has been used in which at least two devices with different polarity discrimination methods are combined.

In this case, in order not to reduce the speed of polarity discrimination, the discrimination time of the added method must be approximately the same or shorter than that of the original method.

However, in the past, this requirement could not always be met depending on the combination, and improvements were desired.

In view of the above points, it is an object of the present invention to provide a polarity determination device for a polarized capacitor that does not reduce the speed of polarity determination (with high determination accuracy).

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, 1a, 1b, -2at2b are electrodes.

These electrodes 1a, 1b, 2a and 2b are attached to the electrode holder 3 at intervals corresponding to the lengths of the lead wires 5 and 52 of the polar capacitor 4 under test, as shown in FIG.

Electrodes 1a and 1b are each connected to ground, and electrodes 2a and 2b are connected to input terminals A and B of a well-known comparator circuit 6, respectively.

The comparator circuit 6 outputs an output signal from the output terminals X, Y, and Z in response to the signals from the input terminals A and B, respectively indicating that the direction is positive, an output signal indicating that the direction is the reverse direction, and the polar capacitor 4 under test. Each output signal is generated to indicate the absence of an output signal.

The first polarity determining section is formed by the electrodes 1a1b, 2a, and 2b and the comparison circuit 6.

Further, FIG. 3 shows a second polarity determining section.

7 is a standard polar capacitor, and the first relay contact 8
The capacitor 4 is connected in series with the polar capacitor 4 under test.

The first relay contact 8 is interlocked with a second relay contact 9 connected in parallel with the standard polar capacitor 7, and when one is closed, the other is open.

The polarity of the polar capacitor 4 under test has already been determined by the first polarity determining section, and is connected to the voltage detection circuit 10 via the first relay contact 8 .

This voltage detection circuit 10 consists of a series circuit of a third relay contact 11 and a well-known comparison circuit 12, and a first relay contact 8
The third relay contact 11 is configured to close after a predetermined period of time from the closing of the test polar capacitor 4, and the comparison circuit 12 detects the terminal voltage level after a predetermined period of time after current starts flowing through the polar capacitor under test 4. A 1 or 00 output signal is generated depending on the level.

The polar capacitor 4 under test also includes an existence detection circuit 1.
3 is connected.

The presence/absence detection circuit 13 stores a resistor 14 connected in series with the polar capacitor 4 under test and a differential pulse generated when a current flows through this resistor 14, and outputs a value of 1 or 0 depending on the presence or absence of the differential pulse. A well-known storage circuit 15 that generates an output signal of
It consists of.

Note that an element such as a coil or a Zener diode may be used instead of the resistor 14, and the voltage detection circuit 10 and the presence/absence detection circuit 13 are further connected to a polarity determination circuit 16.

This polarity discrimination circuit 16 is connected to an inverter 17, a voltage detection circuit 10 via this inverter 16, and a presence detection circuit 13 directly connected to a signal indicating that the polarity capacitor 4 under test is in the opposite direction. 1st A that generates
ND circuit 18, voltage detection circuit 10, and presence/absence detection circuit 13
and a second AND circuit 19 which is directly connected to and generates a signal indicating that the polar capacitor 4 under test is in the positive direction.

In other words, the first polarity determining section and the second polarity determining section constitute a polarity determining device.

Next, the operation of the above embodiment will be described.

First, the lead wires 51 and 52 of the polar capacitor 4 under test are connected to the electrodes in the direction shown in the figure by swinging the electrode holder 3 and the clamp arm 22 to which the rubber plate 21 is bonded via the insulator 20 to the electrode holder 3. Suppose that the electrodes 1a, 1b, and 2a attached to the holder 3 are pressed.

In this case, electrodes 1a and 2a are short-circuited by lead wire 5, and a signal flows to input terminal A. Electrodes 1b and 2b remain open, so no signal flows to input terminal B, and this state is reversed in the forward direction. If so, the output terminal X of the comparator circuit 6
An output signal is generated from , indicating that the orientation of the polarized capacitor 4 under test is correct.

Conversely, electrodes 1a and 2a are open and electrodes 1b and 2
If the polar capacitor 4 under test is oriented in a state where b is short-circuited, the signal will not flow to input terminal A but to input terminal B, so an output signal will be generated from output terminal Y, and it should be in the opposite direction. is shown.

Furthermore, when there is no element, no signal flows through the input terminals A and B, and an output signal is generated from the output terminal Z, indicating the presence or absence of the element.

After the polarity is determined by the first polarity determining section, the polar capacitor 4 under test, which is aligned in a certain direction and taped at regular intervals, is rechecked for polarity by the second polarity determining section. The second polarity determining section may perform the determination without performing inter-chamber processing after the determination by the polarity determining section.

That is, as shown in FIG. 4, each lead wire 5□ and 52 of the polar capacitor 4 under test is attached to the electrodes 24a and 24b attached to the electrode holder 23 by rotating the lead bushing 25. It is pressed by the rubber plate 26 which is attached.

When the lead button 25 swings, this lead button 2
5, the reed button operation confirmation lever 27 also swings, and the microswitch 28 is closed.

By closing the microswitch 28, the first relay contact 8 is closed and the second relay contact 9 is opened.

Therefore, the standard polar capacitor 7, the first relay contact 8
, a current flows transiently through the polar capacitor 4 under test and the resistor 14.

As this transient current flows, a differential pulse is generated in the resistor 14, and this differential pulse is stored in the memory circuit 15 and converted into an output signal of 1.

After t seconds from the closing of the first relay contact 8, the third relay contact 1
1 is closed, but this time of t seconds is longer than the time it takes for the terminal voltage of the polar capacitor 4 under test to reach a steady value.

However, even if the test polar capacitor 4 is connected in the opposite direction, the standard polar capacitor 7 is connected in series, so even if a fairly large current flows, the test polar capacitor 4 will not be destroyed. can be prevented and therefore
can be made small enough that the delay time of seconds can be ignored.

When the third relay contact 11 closes after a delay of such a short time of t seconds, the terminal voltage of the polar capacitor 4 under test is detected by the comparator circuit 12.

Since the test polar capacitor 4 has the same rating as the standard polar capacitor 7, this terminal voltage is determined when the former is connected in the positive direction, that is, the former and the latter are connected with the same polarity. Sometimes it is E/2V, and when connected in the opposite direction it shows almost Ov.

The comparison circuit 12 generates an output signal of 1 when the voltage is E/2V and an output signal of 0 when the voltage is Ov, depending on the terminal voltage of the polar capacitor 4 under test.

That is, when the polar capacitor 4 under test is in the positive direction, an output signal of 1 is generated from the comparator circuit 12, and this output signal is converted by the inverter 17 to a signal of 0.

Therefore, the first AND circuit 18 receives the O signal from the inverter 17 and the 1 signal from the storage circuit 15 to generate an output signal of 0, and the second AND circuit 19 receives the O signal from the inverter 17 and the 1 signal from the storage circuit 15, and generates a 0 output signal. The combination of output signals indicates that the polarized capacitor under test 4 is in the positive direction.

When the polarized capacitor 4 under test is in the opposite direction, the 0 output signal from the comparator circuit 12 is converted to a 1 signal by the inverter 17, and eventually the 1 output signal from the first AND circuit 18 is converted to a 1 signal by the inverter 17.
The combination of the output signal of O and the output signal of O from the second AND circuit 19 indicates the opposite direction.

In this case, especially as shown in FIG. 4, after the polarity of the polar capacitor 4 under test is checked, each lead wire is cut together with the fixed blade 30 by the operation of the movable blade 29. Polar capacitor 4 is removed.

Furthermore, if there is no polar capacitor 4 under test, the output signal of the memory circuit 15 is 0, and therefore the first AN
The output signals of the D circuit 18 and the second AND circuit 19 both become O.

That is, it is possible to determine whether the polar capacitor 4 under test is in the forward direction or in the reverse direction by the output signal from the polarity determination circuit 16,
Moreover, the time required for the determination is approximately the same as the time required for the first polarity determination section to perform the determination.

In the mechanism shown in FIG. 4, two second polarity discriminators are disposed, but even with one second polarity discriminator, the discrimination accuracy can be sufficiently improved.

Further, in the above embodiment, the first polarity discriminator first discriminates the polarity, but conversely, the second polarity discriminator may discriminate the polarity, and then the first polarity discriminator may discriminate the polarity.

Further, the first polarity determining section is not necessarily limited to the above embodiment, and may be of a mechanism that determines the length of the lead wire by a completely mechanical method.

In this case, since the operation is mechanical, the determination speed becomes considerably slow, and the determination time of the second polarity determining section becomes shorter.

As described above, according to the present invention, the polarity can be determined using a plurality of different methods, so that the accuracy of the determination can be improved.

Further, since the time required for the second polarity discriminator to perform the discrimination is approximately the same as or shorter than that of the first polarity discriminator, the overall discrimination time does not become long.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a first polarity determining section of the present invention, FIG. 2 is a perspective view of a mechanism of the first polarity determining section of the present invention, and FIG. 3 is a circuit diagram of a second polarity determining section of the present invention. FIG. 4 shows a perspective view of the mechanism of the second polarity determining section of the present invention. la, lb, 2a, 2b, 24a, 24b...
Electrode, 4... Polar capacitor under test, 51,
52... Lead wire, 6... Comparison circuit,
7...Standard polar capacitor, 10...
...Voltage detection circuit, 13...Presence detection circuit, 1
6...Polarity discrimination circuit.

Claims (1)

[Claims] 1. A first polarity determining section that detects the length and shortness of each lead wire of a polar capacitor under test whose lead wire lengths differ depending on the polarity and determines the polarity; A voltage detection circuit that detects the voltage of the standard polar capacitor that can be applied and the polar capacitor under test and generates an output signal according to the voltage value, and detects the presence or absence of the polar capacitor under test. a second polarity determination circuit that receives output signals from the presence or absence detection circuit and the voltage detection circuit to determine the polarity of the polar capacitor under test; A polarity determining device for a polar capacitor, which includes a polarity determining section.