JPH0448543Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Background of the Invention) The present invention relates to an integrated circuit socket terminal switching device for the purpose of improving integrated circuit testing.

By applying the charge accumulated in the capacitor between two terminals of the integrated circuit and checking whether any abnormal phenomenon has occurred between the terminals, the integrated circuit can be tested and its shortcomings can be detected. It is known to discover or investigate diode characteristics of integrated circuits.

By repeating such measurements while picking up two terminals of an integrated circuit as appropriate, the characteristics of the entire integrated circuit can be known.
It is necessary to switch the terminals appropriately.

However, it is clear that manually switching two terminals of an integrated circuit is extremely inefficient.

On the other hand, when a relay circuit is used to switch two terminals of an integrated circuit, in the relay circuit,
Because many wires are used, the distance between the power supply and each terminal of the integrated circuit is long.

Stray capacitance exists between the lead wire and the ground, and the longer the lead wire, the greater the stray capacitance.

That is, the use of a relay circuit inevitably introduces stray capacitance when measuring the energy stored inside the capacitor.

It is an object of the present invention to provide an integrated circuit socket terminal switching device that can automatically switch each terminal and measure the stored energy with minimal error.

(Structure of the invention) The structure of a socket terminal switching device for an integrated circuit to achieve the above object includes a plurality of sockets into which terminals of an integrated circuit are inserted, and two rows of sockets formed concentrically with each other. a socket base having contact terminals, in the socket base, each terminal of the two rows of contact terminals is connected to a corresponding socket of the plurality of sockets, and each terminal of the two rows of contact terminals is connected to a corresponding socket of the plurality of sockets; This is achieved by providing means for rotating each of the contact terminals and bringing them into contact with two terminals arbitrarily selected from among the two rows of contact terminals. This will be explained below with reference to the drawings.

First, before entering into the description of the present invention, in order to contribute to the understanding of the present invention, we will explain the testing of integrated circuits.

FIG. 1 shows a circuit for discharging energy stored in a capacitor between two terminals of an integrated circuit, and a circuit diagram for measuring diode characteristics of the integrated circuit.

In FIG. 1, capacitor C is charged by switching switch 21 to the power supply circuit side.

On the other hand, close the switch 22 and turn on the current source 43.
A current is passed through two terminals of the integrated circuit selected in advance, and the voltage at the two terminals is measured using a voltmeter V. Next, when the switch 22 is opened and the switch 21 is switched to the integrated circuit side, the charge accumulated in the capacitor C flows between the two terminals of the integrated circuit, and the accumulated energy of the charge flows between the two terminals of the integrated circuit. will be damaged. In order to measure the degree of damage, the switch 21 is disconnected from the integrated circuit 1 side and left in the neutral state, the switch 22 is closed again, a current is applied to the integrated circuit from the current source 43, and the voltage is measured by the voltmeter V. By measuring the voltage generated between the two terminals at the time, it is possible to know the change in the diode characteristics before and after applying the energy stored in the capacitor C to the two terminals.

While repeating the above method, if an abnormal phenomenon occurs between the two terminals, the stored energy applied between the two terminals is measured using the voltmeter 3.

After measuring the diode characteristics between the two terminals, another two terminals are selected for which the diode characteristics are further measured by the method described above.

FIG. 2 shows a circuit diagram for automatically repeating the above measurement method by using a programmer controller.

In FIG. 2, switching devices 51 and 52 are used to pick up any two terminals, and a programmer controller 42 is used to control the power supply voltage and switching device according to a preset program. used.

In FIG. 2, the programmer controller 42
not only controls the voltage power supply 41 and the current power supply 43 but also controls the switching devices 51 and 52.

According to the control of the programmer controller, the current flowing from the current 43 to the voltmeter 3 is:
It is controlled to a constant magnitude in accordance with the control value of the voltage applied to two arbitrarily selected terminals of the integrated circuit.

At each control stage of the programmer controller 42 for the voltage power supply 41 and the current power supply 43, the diode characteristics between two terminals are measured in the same way as the measurement shown in FIG. 1, and it is determined whether an abnormal phenomenon has occurred between the two terminals. You can know what.

The pin switching devices 51 and 52 will operate according to a preset program in the programmer controller to pick up any two terminals of the integrated circuit.

The present invention provides a specific configuration of the pin switching devices 51 and 52 used in testing such integrated circuits, and FIG. 3 shows the configuration of an embodiment of the socket board used in the present invention.

In FIG. 3, a plurality of sockets a ₁ , a ₂ . . . an are provided for inserting respective terminals of the integrated circuit.

The two rows of contact terminals b ₁ , b ₂ ...bn and c ₁ , c ₂ ...cn are
They are arranged concentrically with each other and attached to the socket base 6.

Each contact terminal bi and ci is connected to a corresponding socket ai (i= ₁ , ₂ , . . . n).

FIG. 4a shows the construction of an embodiment of the switching device of the invention.

In FIG. 4a, contact pins 511 and 521 are attached to the tops of concentric shafts 512 and 522, and rotation of the concentric shafts 521 and 522 provides rotational movement for switching. Note that the ball bearing 11 is used to prevent friction.

Concentric shafts 521 and 522 are connected to belts 514 and 52
4 and are rotated by motors 513 and 523.

Connection between the contact terminals and the voltage power source is achieved by connecting contact pins 511 and 521 to contact terminals bi and cj appropriately selected from two rows of contact terminals b ₁ , b ₂ ...bn and c ₁ , c ₂ ...cn.
This is done by connecting each contact pin 511 and 521 to a wiring spring 81 and 82, respectively, which is connected to the voltage source 4. The relative positions of the contact pins 511 and 521 and the contact terminals bi and cj are the same as those of the concentric axes 512 and 5.
It is controlled by raising and lowering 22.

In the embodiment shown in FIG. 4a, contact pin 511 connects to wiring spring 81 through arm 516 and cap 17, while contact pin 521 connects to arm 526, concentric shaft 522 and ball bearing 1.
1. It contacts the wiring spring through the stand 13 and the bar 14.

The rotation angle of each concentric shaft 512, 522 is measured by a potentiometer 515, 525 in order to determine whether the position of the contact pin 511, 512 is below the contact terminal bi, cj. There is.
When the contact pins 511 and 512 are located below the contact terminals bi and cj, the solenoid 7 is applied, and the concentric shafts 512 and 522 generate a magnetic force induced between the solenoid 7 and the magnet 9. The contact pins 511 and 521 are raised together with the respective concentric shafts 512 and 522, and the contact terminals bi
I will come into contact with CJ.

Here, the magnetic force is caused by the rotational moment about the bar 14 and the fifteenth fulcrum 15, which causes the concentric shaft 5 to move.
12 and 522.

The ball bearing on the stand 13 is a concentric shaft 5
12 is used for smooth rotation.

When the contact pins 511 and 512 contact the contact terminals bi and cj, respectively, the wiring spring 8
1 is resiliently contacted by the cap 17;
The wiring spring 82 is elastically contacted by the bar 14, and each contact terminal bi and cj is connected to the voltage power source 41 through the wiring springs 81 and 82.

When the input to the solenoid 7 is cut off, the concentric shafts 512 and 522 will fall under their own gravity.

Conversely, if the concentric shafts 512 and 522 are not raised, each contact pin 512 and 522 is separated from the contact terminals bi and cj, respectively, so that the wiring springs 81 and 82 and 5
22, and each contact terminal bi and cj will not be connected to the voltage power supply. In addition to the connection with the voltage power supply, the wiring spring 82 also has contact pins 511 and 521 connected to the concentric shaft 51.
2 and 522 act to adjust the force that pushes the contact terminals bi and cj when the contact pins 511 and 521 are brought into contact with the contact terminals bi and cj, respectively.

FIG. 4b shows a cross-sectional view of concentric axes 512 and 522, as shown here.
22 are designed so as not to come into contact with each other.
As shown in FIG. 4a, an insulator 10 is provided on the upper part of the concentric shaft 512 to prevent the contact pins 511 and 521 from shorting each other.

FIG. 5a shows the construction of another embodiment of the switching device of the present invention.

In FIG. 5a, as shown in FIG. 5b, contact pins 511 and 512 pushed from below by support springs 83 and 84 are connected to the contact terminal bi.
In order to elastically contact cj and switch the socket terminal, it performs rotational movement while sliding on the socket base.

In FIG. 5a, contact pins 511 and 512
This means that it is always in contact with the socket base 6.

However, instead of the method described in connection with FIG. 4a, a switch 12 is used to open and close the connection between the contact pins 511 and 521 and the voltage source.

In the embodiment shown in FIGS. 4a and 5a, the two terminals of the integrated circuit are arranged on concentric axes 512 and 52.
This is possible by rotating 2.

In these embodiments, the length of the lead wire between the terminal of the integrated circuit and the voltage source can be designed much shorter than when using a relay circuit, and the length of the lead wire between the lead wire and the ground can be designed to be much shorter than when using a relay circuit. The influence of stray capacitance between the two can be minimized, and errors in measuring the diode characteristics of the integrated circuit can be minimized.

As described above, the present invention is extremely convenient because the diode characteristics of an integrated circuit can be measured accurately using a relatively simple method.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a circuit for discharging energy due to charge accumulated in a capacitor between two terminals of an integrated circuit, and a circuit for measuring diode characteristics of the integrated circuit. FIG. 2 is a circuit diagram illustrating automatically repeating the measurements shown in FIG. 1 by using a switching device and a programmer controller to pick up two terminals as appropriate.
FIG. 3 is a plan view of a socket base embodiment of the present invention. FIG. 4a is a side view and partially cutaway view of the switching device of the present invention. Figure 4b is the same as Figure 4a.
FIG. 3 is a coaxial cross-sectional view of the embodiment of the switching device shown in the figure; FIG. 5a shows the switching device of the invention,
FIG. 7 is a side view and partially cutaway view of another embodiment. Fifth
Figure b is a side view and partial sectional view of the contact pin and wiring spring shown in Figure 5a. 1...Integrated circuit, 21, 22...Switch, 3
... Voltmeter, 41 ... Voltage power supply, 42 ... Programmer controller, 43 ... Current source, 51,
52... Pin switching device, 511, 521... Contact pin, 512, 522... Coaxial rotating shaft, 513,
523...Step motor, 514, 524...
... Belt, 515,525 ... Potentiometer, 516,526 ... Arm, 6 ... Socket base, 7 ... Solenoid, 81, 82 ... Wiring spring, 9 ... Magnet, 10 ... Insulator, 11
... Ball bearing, 12 ... Switch, 13
...stand, 14...bar, a ₁ , a ₂ ...an ... socket for each terminal of the integrated circuit, b ₁ ,
b ₂ …bn, c ₁ , c ₂ …cn…two rows of contact terminals.

Claims (1)

[Claims for Utility Model Registration] (1) A socket base having a plurality of sockets for inserting the terminals of an integrated circuit and two rows of contact terminals arranged on a concentric axis, each contact of the two rows of contact terminals; The terminal is characterized in that it is connected to each corresponding socket of the plurality of sockets, and each of the two contact pins is rotated, and each of the two contact pins is connected to two contacts appropriately selected from the two rows of contact terminals. A terminal switching device for an integrated circuit, characterized by comprising means for contacting the terminal. (2) A request for registration of a utility model characterized in that the two contact pins are respectively attached to the tops of the two concentric shafts and can each perform circular motion by rotation of the two concentric shafts. A terminal switching device for an integrated circuit according to scope (1). (3) The connection between the contact terminal and the voltage power source is such that each of the two contact pins contacts two randomly selected contact terminals of the two rows of contact terminals, and each of the two contact pins makes contact with each of the two randomly selected contact terminals. The relative positions of the two contact pins and the above two contact terminals are set up and down on each of the two concentric axes. A socket terminal switching device for an integrated circuit according to claim (2) of the utility model registration, characterized in that the device is controlled by: (4) The integrated circuit socket terminal switching device according to claim (3), wherein each concentric shaft is moved up and down by a magnetic force induced between a solenoid and a magnet. (5) The contact pin, which is pushed from below by the two support springs, contacts two contact terminals appropriately selected from the two rows of contact terminals, and moves in a circular motion while sliding on the socket base. A socket terminal switching device for an integrated circuit according to claim (2) of the utility model registration. (6) The socket terminal switching device for an integrated circuit according to claim (2), wherein the rotation angle of each concentric shaft is measured by a potentiometer.