JPS6244364Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an input/output probe for connecting a measuring instrument and an object to be measured.

[Problems with conventional technology]

2. Description of the Related Art When measuring a polarized electrical circuit part using a measuring instrument such as a tester or a multimeter, the polarity of the measuring instrument and the object to be measured may not match. For example, when carrying out simple inspections of circuit parts and components mounted with polarized electronic components such as diodes and transistors, the frequency of the above-mentioned measurements is increasing.

In such cases, a problem with conventional probes is that in order to match the positive and negative electrodes, it is necessary to change the probe, reapply the tip metal fitting, and review the instructions on the measuring instrument.

[Problem that the invention attempts to solve]

The present invention has been made to eliminate the drawbacks of the prior art described above, and its purpose is to provide an input/output probe that is easy to handle and capable of rapid measurement. That is, by providing the probe with a switch that changes the connection between the electric wire from the measuring instrument and the connecting fitting, it is possible to change the polarity at the probe's hand while making measurements. By making the connection status change in response to changes in position, the polarity can be switched by pressing the connection fitting against the object to be measured, etc.
The purpose is to enable measurements to be made without the need to change hands or while holding the probe with one hand.

[Means for solving problems]

In short, the present invention includes at least two connecting fittings 8 and 9 for contacting the object to be measured 14, at least one holding member 10A that holds at least one of the connecting fittings so as to protrude from the tip,
10B, and switches 6, 7 provided in the holding member for switching the polarity of connection of at least two electric wires 4, 5 to the connection fittings, the input/output probe comprising: At least one of the holding members 10A, 10B at the tip of the connecting fitting
the switch is held within the retaining member such that its relative position relative to the retaining member can be changed, and the switch assumes at least two different connected states depending on the position of the connecting fitting relative to the retaining member. It is characterized by the fact that it is

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. As shown in FIG. 1, the input/output probe 20 according to the first embodiment of the present invention includes connection fittings 8 and 9 for contacting an object to be measured, and a holding member that holds the connection fittings 8 and 9. 10A, 10B, and switches 6, 7. switch 6,7
is for switching the polarity of the connection between the electric wires 4, 5 connected to the measuring instrument 1 via the plugs 13A, 13B and the connecting fittings 8, 9.

As shown in the enlarged side view of FIG.
includes a metal piece 15A having a contact a, a metal piece 15B having a contact b, and an insulating holding part 17 to which these are fixed. The connecting fitting 8 constitutes a switch section of the switch 6, is held by an insulating holding part 17, and is elastically biased toward the metal piece 15A at the normal initial position P0, and is in contact with the contact point a. . The switch 7 is constructed symmetrically in exactly the same way as the switch 6, and will be given the same reference numeral as the switch 6 or the same reference numeral with the addition of the alphanumeric character B, and a description thereof will be omitted.

The electric wire 4 is connected to the metal piece 15A, and the electric wire 5 is connected to the metal piece 15B. The metal piece 15A of the switch 6 and the metal piece 16B of the switch 7 are connected by an electric wire 4' which is an example of a conductor, and the metal piece 15B of the switch 6 and the metal piece 16A of the switch 7 are connected by an electric wire 5' which is an example of a conductor. has been done.

FIG. 2 shows an electric circuit diagram corresponding to the input/output probe 20 shown in FIG. The resistor 14 is an example of an object to be measured. Note that this electric circuit is an equivalent representation of the electrical connection of the input/output probe 20, and does not necessarily correspond specifically.

Input/output probe 2 according to the first embodiment of the present invention
0 is configured as described above, and its operation will be described below by illustrating a case where an electronic component mounted on a printed wiring board is simply inspected.

As shown in FIG. 2, an electric wire 4 is connected to the positive terminal 2 of a measuring device 1 for measuring resistance value, and an electric wire 5 is connected to the negative terminal 3 of the measuring device 1. is the diode 19 as shown in the figure.
are connected in parallel.

Here, as shown in FIG.
is the lead wire 40 of the resistor 14, which is an example of the object to be measured.
If you press it lightly against A, 40B, the connection fitting 8,
9 remains in contact with the contacts a of the metal pieces 15A and 15B, so the positive terminal 2, the connecting fitting 8, and the negative terminal 3
and the connecting fitting 9 are connected to each other.

At this time, if the current 11 related to measurement flows in the direction shown by the arrow, a forward current flows through the diode, making it impossible to measure the resistance value of the resistor 14 (polarity mismatch).

In such a case, as shown in FIG. 3, if the connecting fittings 8.9 are pressed more strongly against the resistor 14 and the widths of the holding members 10A, 10B are narrowed as shown by the arrows, the switches 6, 7 As shown in the dotted line in the figure and in FIG. 5, the connection state is switched, and the connecting fittings 8 and 9 each contact the contact point b at the polarity switching position P1. As a result, the flowing current I2 flows in the direction shown in FIG. 5, and the diode 19 is reverse biased, so that the resistance value can be measured almost accurately.

Although the above explanation has been given regarding the inspection of a resistor to which a diode is connected, it goes without saying that it can be used more generally to switch polarity when measuring voltage, current, etc.

Further, in the above embodiment, the switches 6 and 7 are
Although the switch has been described as being made up of metal pieces 16A, 15A, etc. as shown in FIG. 4, it can be made up of a commercially available box-shaped switch, such as a micro switch. Furthermore, although the switches 6 and 7 have been described as having switch segments that operate independently, they are configured such that an interlocking switch is provided on one of the holding members, and the connection polarity is switched by changing the position of one of the connection fittings. You can also take

Further, in the above embodiment, the switches 6 and 7 were explained as an example in which they are switched when operated in a direction to adjust the interval between the holding members 10A and 10B, but of course the switch is not limited to this, and the switches 6 and 7 are switched to the top, bottom, left and right of the connecting fittings, Alternatively, it goes without saying that the connection state can be switched in response to positional displacement in the in/out direction and in the twisting direction with respect to the holding member. For example,
This can be achieved by installing a commercially available small switch within the holding member. In addition, the switches 6 and 7 shown in FIG.
If they are arranged in a direction rotated by 90 degrees with respect to the center axis of A and 10B, the connection can be made by pressing the connecting fittings 8' and 9' downward, respectively, as shown in Figs. 6 and 7. You can switch states.

Further, in the above embodiment, the holding member 10
Rod-shaped connection fittings 8 and 9 held by A and 10B
Although an example in which two (test leads) are arranged in parallel has been illustrated and described, the present invention is not limited to this, and it is also possible to use only one test lead and use other connecting fittings such as alligator clips. Further, for example, when configuring a probe for an electric wire with a shielded wire, the number of connecting fittings can be two or more. Furthermore, instead of holding the rod-shaped connecting fittings by separate holding members, it is also possible to adopt a configuration in which the two connecting fittings are held by an integrally formed holding member.

Furthermore, the switch for changing the polarity is not limited to the electric circuit shown in FIG.
For example, an electric circuit as shown in FIG. 8 is also conceivable.

〔effect〕

Since the present invention is constructed and operates as described above, by providing a switch that switches the connection in response to the movement of the connecting fitting that is held and protrudes from the tip of the holding member, it is possible to The advantage is that the polarity can be switched by pressing the connecting fitting against the object to be measured, etc., without having to change the probe. Therefore, when the present invention is used for measurement, it is possible to improve the efficiency of measurement work.

[Brief explanation of the drawing]

The drawings relate to embodiments of the present invention; FIG. 1 is a perspective view of an input/output probe according to the first embodiment, FIG. 2 is an electrical circuit diagram of the input/output probe shown in FIG. 1,
3 is a perspective view showing how the input/output probe shown in FIG. 1 is used, FIG. 4 is a side view showing an enlarged switch of the input/output probe according to the first embodiment, and FIG. 5 is an electrical circuit diagram of the input/output probe shown in FIG. 2 in use, FIG. 6 is a perspective view of the input/output probe according to the embodiment, and FIG. 7 is an electrical circuit diagram of the input/output probe shown in FIG. 6. FIG. 8, which is a perspective view showing a state of use, is an electric circuit diagram of an input/output probe according to another embodiment. 4, 5: electric wire, 6, 7: switch, 8, 9: connection fitting, 10A, 10B: holding member.

Claims (1)

[Utility Model Claims] 1. An input/output probe comprising at least two connection fittings 8, 9 for contacting an object to be measured 14, at least one holding member 10A, 10B for holding at least one of the connection fittings so that it protrudes, and a switch 6, 7 provided within the holding member for switching the polarity of the connection of at least two electric wires 4, 5 to the connection fittings, wherein at least one of the connection fittings 8, 9 is held within the holding member so that the relative position of the connection fitting to the holding member 10A, 10B can be changed, and the switch is adapted to take at least two different connection states corresponding to the position of the connection fitting to the holding member. 2. The switch comprises at least two three-terminal switches 6, 7, and the three-terminal switches 6, 7
is a changeover contact terminal a with which the switch segment comes into contact when the connecting metal fittings 8, 9 are in the initial position P0.
and a switching contact terminal b with which the switch segment comes into contact when the connecting metal fittings 8, 9 are in the polarity switching position P1.
The changeover contact terminal b of one three-terminal switch 7 is connected by a conductor 4', and the changeover contact terminal b of one three-terminal switch 6 and the changeover contact terminal a of the other three-terminal switch 7 are connected by a conductor 5'.
The one electric wire 4 and one of the connecting fittings 8 are connected to the changeover contact terminal a and the switch intercept terminal c of the one three-terminal switch 6.
and the other electric wire 5 and the other one of the connecting fittings 9 are connected via a changeover contact terminal a and a switch intercept terminal c of the other one of the three-terminal switches 7. 3. The input/output probe according to claim 1 or 2, characterized in that the holding members 8, 9 are connected to each other by an elastic member 12.
Item 5. An input/output probe according to item 1.