JPH0562863U - Spring probe - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to detect the arrangement of terminals of electronic parts. [Constitution] A conductive plunger 19 is inserted into a substantially cylindrical conductive barrel 11. Plunger 19 with spring 23
Support. The conductive terminal 24 is fixed while the rear opening 13 of the barrel 11 is inserted. A protrusion (14) is provided at an intermediate portion of the barrel, the protrusion (14) protruding toward the inner surface of the barrel and coming into contact with the expanded contact portion (22) of the plunger (19). Always, the plunger
19, the terminal 24, the protrusion 14 of the barrel 11 and the contact portion 22 of the plunger 19 are in contact with each other. When the plunger 19 is pressed against the object to be measured, the plunger 19 retracts, the plunger 19 and the protrusion 14 are separated from each other, and become in an insulated state. [Effect] It is possible to simultaneously detect the arrangement state of the measured object such as the terminal of the measured object being longer than the measurement dimension. The number of measurements can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spring probe used for detecting the disposition state of electronic parts and the like.

[0002]

[Prior Art]

 Conventionally, this type of spring probe is known to have a structure disclosed in, for example, Japanese Utility Model Laid-Open No. 2-5072. As shown in FIG. 2, this conventional spring probe has a barrel 1 having a cylindrical shape, and a substantially cylindrical shape urged by a spring body 2 in a direction projecting from an opening at a front end of the barrel 1. The conductive measuring terminal (plunger) 3 is provided so as to be capable of advancing and retreating, and the conductive terminal 5 is provided so as to project from the opening at the rear end.

Further, the terminal 5 includes a substantially cylindrical conductive tube body 6 having a closed rear end portion, a spring body 7 and a plunger 8 inserted into the tube body 6. A substantially cylindrical enlarged diameter portion 8a is integrally formed at the rear portion of the plunger 8 inserted into the tubular body 6, and the enlarged diameter portion 8a is provided inside the tubular body 6 by a cylinder 9a. The rear end of the expanded diameter portion 8a is elastically pressed to the front side by the spring 7 and the front end of the expanded diameter portion 8a is opened at the front end of the cylinder 9. The front portion of the plunger 8 projects forward from the opening portion of the front end of the cylinder 9 while being locked by the locking portion 9a that has been caulked to a small diameter, and through the gap L with the rear end portion of the plunger 3. They are facing each other.

The spring probe is normally insulated from each other by the urging force of the spring body 2 in a state where the plunger 3 and the terminal 5 are separated from each other, but the tip 3a of the plunger 3 is covered. When it is pressed against the object to be measured, the plunger 3 moves backward against the urging force of the spring body 2 and comes into contact with the plunger 8 of the terminal 5, so that a reliable electric conduction is obtained.

Therefore, after fitting a socket (not shown) to the terminal 5 and connecting the lead wire led out from this socket to a measuring instrument or the like, the measured wiring such as the printed wiring in the test circuit or the terminal of the electronic component is measured. The arrangement state of the object to be measured can be detected while pressing the tip portion 3a of the plunger 3 against the object, retracting the plunger 3 and bringing the plunger 3 and the terminal 5 into contact with each other to ensure electrical continuity. It is like this.

[0006]

[Problems to be solved by the device]

 However, in the above-described conventional spring probe, since the terminal 5 is composed of the pipe body 6 and the spring body 7 and the plunger 8 inserted into the pipe body 6, the structure becomes complicated. However, there is a problem that it is difficult to reduce the diameter.

In the above conventional structure, it is difficult to detect the presence or absence of the object to be measured and the object to be measured which is improperly arranged such that the terminals of the electronic component as the object to be measured are longer than the set dimension. There is also a problem.

The present invention has been made in view of such a point, and can detect an improper measured object such as a case where a terminal such as an electronic component of the measured object is longer than a set dimension, and is inexpensive and compact. The purpose is to provide a flexible spring probe.

[0009]

[Means for Solving the Problems]

 The spring probe of the present invention comprises a conductive cylindrical barrel having a front opening and a rear opening, and a conductive terminal fixed to the barrel with the rear opening partially inserted. With the front opening partially inserted, it was urged in a direction projecting from the front opening by a conductive spring, and inserted in the barrel so as to be able to move forward and backward while maintaining electrical insulation. An electrically conductive plunger, the plunger forms an expanded contact portion, and a protrusion is provided at an intermediate portion of the barrel for conducting by contact with the contact portion of the plunger. The rear end of the plunger is electrically connected to the terminal via the spring, the plunger and the protrusion are in contact with each other, and the tip of the plunger is pressed backward. In which engaging portion is spaced apart from the protrusion.

[0010]

[Action]

 In the spring probe of the present invention, the plunger and the terminal are always in electrical communication with each other, and the terminal of the electronic component, which is the DUT, is longer than the set dimension. When the tip of the plunger is pressed against the biasing force of the spring, the plunger retracts, the engaging part of the plunger separates from the protruding part of the barrel, and the continuity between the two is interrupted, and the measured object An improper arrangement state is detected.

[0011]

【Example】

 A configuration of an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 11 denotes a barrel having a substantially cylindrical shape. The barrel 11 is made of a conductive material such as brass plated with nickel, and has front and rear ends, respectively. An opening 12 and a rear opening 13 are formed.

Then, an annular protrusion 14 crimped to a small diameter is formed in the middle portion of the barrel 11, and a locking portion 15 crimped to a small diameter is formed in front of the protrusion 14, and the vicinity of the rear opening 13 is formed. A fixing portion (16) crimped to a small diameter is formed on the.

Further, a protruding portion 17 that bulges in an annular shape outward is formed near the front end portion of the barrel 11, and the barrel 11 of the spring probe is press-fitted and fixed in a mounting hole of a probe board (not shown). When arranging the spring probe, the overhanging portion 17 elastically engages with the mounting hole of the probe board to more securely fix the spring probe.

Further, a cylindrical insulating material 18 is fitted on the inner surface side of the barrel 11 at a position on the front side of the position of the protruding portion 14, and a rear end portion of the insulating material 18 projects from the front opening 12 of the barrel 11. In this state, the locking portion 15 is fixed by caulking, and is integrally formed with the overhang portion 17. The rear portion of the rear insulator 18 fitted behind the protrusion 14 of the barrel 11 protrudes from the rear opening 13, and the protruding portion is formed to have substantially the same diameter as the outer diameter of the barrel 11. ..

A plunger 19 is inserted in the inner front part of the barrel 11. The plunger 19 is formed of a conductive metal such as copper-plated beryllium-copper alloy into a substantially cylindrical shape, and the measurement terminal portion 20 that partially protrudes from the barrel 11 is provided on the front side of the intermediate portion in the axial direction. Is formed, and a contact portion 21 that is pressed against the object to be measured is provided at the tip of the measurement terminal portion 20. Further, a small diameter portion 19a is formed in the middle portion of the plunger 19, and a contact portion 22 whose diameter is enlarged by the step of the small diameter portion 19a is formed, and the front end of the contact portion 22 abuts the protrusion 14. A truncated cone-shaped engaging portion 22b is formed, and a rear end portion thereof forms a conical spring receiving portion 22a.

In the plunger 19, the engaging portion 22b at the front end of the contact portion 22 is the protrusion of the barrel 11 when the measuring terminal portion 20 is slidably inserted through the front opening portion 12 and protrudes forward. The rear end of the portion 14 is abutted and locked.

A coil-shaped spring 23 is inserted into the barrel 11, and the front end of the spring 23 abuts against and presses the spring receiving portion 22a at the rear end of the contact portion 22 of the plunger 19 to move the plunger 19 forward. I am urged.

Further, a terminal 24 is fitted through the rear opening 13 of the barrel 11. The terminal 24 has a substantially cylindrical shape made of copper-plated brass or the like, has a sharp tip at the front end, and has a small-diameter cut groove 25 in the middle portion. A terminal portion 26 is formed at the rear end portion of the terminal 24, which is fixed by engaging with the fixed portion 16 and protrudes from the rear opening portion 13 of the barrel 11.

The rear end of the contact portion 22 of the plunger 19 and the front end of the terminal 24 are electrically connected via the spring 23.

A socket or the like from which a lead wire (not shown) is drawn out is fitted and connected to the terminal portion 26.

Further, a terminal portion (not shown) is formed on the barrel 11, and a socket or the like from which a lead wire (not shown) is led out is fitted and connected to the terminal portion.

Next, the operation of the spring probe of this embodiment will be described.

First, a probe board (not shown) having mounting holes formed at a plurality of positions according to the position of the object to be measured is prepared. Then, the rear portion of the barrel 11 of the spring probe is press-fitted into each of these mounting holes, and the overhanging portion 17 is engaged and fixed. In addition, the lead wire connected to a measuring instrument or the like is connected to the terminal portion 26 of the terminal 24 and the terminal portion of the barrel 11 (not shown) through a socket.

When the probe board is held apart from the object to be measured, and the contact portion 21 of the measuring terminal portion 20 of the plunger 19 is separated from the object to be measured, the urging force of the spring 23 is applied. The plunger 19 is pressed to the front by the rear end of the contact portion 22 of the plunger 19 and the front end of the terminal 24, which are opposed to each other with a predetermined clearance through the spring 23. The plunger 19 and the terminal 24 are electrically connected to each other, and the contact portion 22 of the plunger 19 and the protrusion 14 of the barrel 11 are electrically connected to each other.

Next, the probe board is brought close to the object to be measured, and the abutting portions 21 of the plungers 19 of the spring probes are brought close to the object to be measured all at once, so that the terminals of the electronic parts as the object to be measured are set. When the abutting part 21 of the plunger 19 is pressed against the biasing force of the spring 23 against the object to be measured that is improperly arranged such as longer than the size, the contact part 22 compresses the spring 23 and the biasing force is increased. Move backwards against. Then, the contact portion 22 of the plunger 19 is separated from the protruding portion 14 of the barrel 11, and the conduction between the two is cut off.

As described above, according to the spring probe of the present embodiment, the presence or absence of an object to be measured such as an electronic component and the arrangement state can be performed almost simultaneously, so that the number of measurements can be reduced.

[0028]

[Effect of the device]

 In the spring probe of the present invention, the plunger and the terminal are always in electrical communication with each other, and the terminal of the electronic component, which is the DUT, is longer than the set dimension. When the contact part of the plunger is pressed by applying the load of the biasing means, the plunger retracts, the contact part of the plunger is separated from the protruding part of the conductive barrel, and the conduction between the two is cut off. Since the presence or absence of an object to be measured such as an electronic component and the arrangement state can be performed almost at the same time, the number of measurements can be reduced. Then, an improper arrangement state of the object to be measured is detected. Further, since it has a simple structure, it can be manufactured easily and inexpensively and can be made compact.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a spring probe of the present invention.

FIG. 2 is a partially cutaway side view showing a conventional spring probe.

[Explanation of symbols]

 11 Barrel 12 Front opening 13 Rear opening 14 Projection 19 Plunger 22 Contact 22b Engagement 23 Spring 24 Terminal

Claims (1)

[Scope of utility model registration request] 1. A conductive cylindrical barrel having a front opening and a rear opening, a conductive terminal fixed to the barrel with the rear opening partially inserted, and the front portion. With a conductive plunger inserted in the barrel so as to be able to move forward and backward while being biased by a conductive spring in a direction projecting from the front opening in a state where the opening is partially inserted, The plunger has a contact portion with an enlarged diameter, and a protrusion is provided at an intermediate portion of the barrel so as to be in contact with and engage with the contact portion of the plunger. While engaging with the terminal via a spring, the plunger and the protrusion are in contact with each other, and the engaging portion of the plunger is in contact with the protrusion while the tip of the plunger is pressed backward. Bed - spring pro characterized in that it is between.