JPH0590373U - Spring probe - Google Patents

Abstract

(57) [Summary] [Structure] The front opening of the substantially cylindrical barrel 11 is caulked to a small diameter to form the locking portion 16. An annular protrusion 18 is formed on the outer periphery of the barrel 11. A conductive plunger (21) having a flange (25) formed in the middle is inserted into the barrel (11). The spring body 31 presses the flange portion 25 against the locking portion 16. The conductive terminal 41 is fixed while the rear opening 15 of the barrel 11 is inserted. Normally, the fitting projection 26 at the rear end of the plunger 21 and the fitting recess 44 at the front end of the terminal 41 are separated by a gap a for insulation. Plunger 21 tip 22
When a is pressed against the object to be measured, the plunger 21 retracts, the fitting projection 26 and the fitting recess 44 are fitted and connected, and they are electrically connected. [Effect] The strength and continuity test of the object to be measured can be performed simultaneously. The plunger 21 and the terminal 41 can be reliably electrically conducted. The simple structure facilitates manufacturing. Barrel 11
Can be made smaller. The barrel 11 can be securely fixed to the probe board.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spring probe used for an electrical continuity test of electronic parts and the like.

[0002]

[Prior Art]

 Conventionally, for example, as disclosed in Japanese Utility Model Laid-Open No. 2-5072, and as shown in FIG. 2, a barrel 1 having a cylindrical shape is provided, and is elastically supported by a spring body 2 from an opening at the front end of the barrel 1. There is known a spring probe in which a conductive measuring terminal (plunger) 3 having a substantially cylindrical shape is provided so as to be able to move forward and backward, and a conductive terminal 5 is provided so as to project from an opening at a 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 expanded diameter portion 8a is integrally formed at the rear portion of the plunger 8, and the expanded diameter portion 8a is slidably fitted inside the tube body 6. In addition, the rear end portion of the expanded diameter portion 8a is elastically pressed forward by the spring body 7, and the front end portion of the expanded diameter portion 8a is caulked at the opening of the front end of the tubular body 6 to a small diameter. In the state of being locked by 6a, the front portion of the plunger 8 projects forward from the opening at the front end of the tubular body 6 and faces the rear end portion of the plunger 3 with a gap L therebetween.

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 portion 3a of the plunger 3 is covered. When pressed against the object to be measured, the plunger 3 retreats against the urging force of the spring body 2 and comes into contact with the plunger 8 of the terminal 5, and then both plungers 3 and 8 are brought into close contact with each other and integrated. It is designed to move backwards to ensure reliable electrical continuity.

Therefore, after fitting a socket to the terminal 5 and connecting the lead wire led out from the socket to a measuring instrument or the like, an object to be measured such as a printed wiring in a test circuit or a terminal of an electronic component is measured. The tip 3a of the plunger 3 is pressed against the, the plunger 3 is retracted, the plunger 3 and the terminal 5 are brought into contact with each other, and the electrical continuity is ensured. A continuity test can be performed.

Further, in this spring probe, a constant weight can be applied to the object to be measured through the tip portion 3a of the plunger 3 by the urging force of the spring body 2. It is possible to perform a strength test of an object.

[0007]

[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 particular, in recent years, a large number of spring probes are arranged at high density, and the continuity test of each part of the object to be measured having a fine structure is simultaneously performed, so that the barrel 1 is made smaller in diameter. However, depending on the above conventional structure, it is difficult to make the outer diameter of the barrel 1 small, for example, 2 mm or less.

The present invention has been made in view of such a point, and it is possible to further reduce the outer diameter of the barrel and expand the measurement range while surely maintaining the electrical continuity between the plunger and the terminal. The purpose is to provide a spring probe capable of

[0010]

[Means for Solving the Problems]

 The spring probe according to claim 1 has a tubular barrel having a front opening and a rear opening, an electrically conductive terminal fixed to the barrel with the rear opening inserted, A conductive plunger that is elastically supported by a biasing means in a state of being inserted through the front opening portion and is provided on the barrel so as to be able to move back and forth. In a spring probe in which the rear end of the plunger is in contact with the front end of the terminal while the front end of the plunger is pushed rearward, the spring probe is fitted to the front end of the terminal. A fitting recess is formed, and a fitting projection that is removably connected to the fitting recess is formed at the rear end of the plunger.

A spring probe according to a second aspect of the present invention is the spring probe according to the first aspect, wherein the front opening portion of the barrel is crimped to a small diameter to form a locking portion, and A projecting portion is provided on the outer peripheral surface.

[0012]

[Action]

 In the spring probe of the present invention, the tip end of the plunger is pressed against the DUT against the urging force of the urging unit, the load of the urging unit is applied to the DUT, and the strength test is performed. When the tip of the plunger is pressed further against the DUT, the plunger retracts further, and the fitting protrusion at the rear end of the plunger fits into the fitting recess at the front end of the terminal, ensuring that both Conduct to. In this state, energize to conduct a continuity test of the DUT.

[0013]

【Example】

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

In FIG. 1, 11 is a substantially cylindrical barrel, and this barrel 11 is made of, for example, brass plated with nickel, and has front opening 12 and rear opening at the front and rear ends, respectively. 15 are formed.

The front opening 12 is crimped to have a small diameter and serves as a locking portion 16.

Further, in the vicinity of the front end portion of the barrel 11, an outwardly bulging portion 18 which is annularly bulged is formed, 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 18 elastically engages with the mounting hole of the probe board to more securely fix the spring probe.

A plunger 21 is inserted into the barrel 11 through the rear opening 15. The plunger 21 is formed of a conductive metal such as copper-plated beryllium copper alloy into a substantially cylindrical shape, and an expanded cylindrical flange portion 25 is formed at an intermediate portion in the axial direction. .. The front side of the flange portion 25 is a measurement terminal portion 22, and the tip of the measurement terminal portion 22 is a tip portion 22a that is pressed against the object to be measured. The rear portion of the plunger 21 is formed to have a diameter slightly smaller than that of the measuring terminal portion 22, and a tip or a sharp fitting projection 26 is formed at the rear end portion.

The plunger 21 is inserted into the barrel 11 through the rear opening 15, and the measuring terminal 22 is slidably inserted through the front opening 12 and projects forward. The front end of the flange portion 25 abuts on and is locked by the locking portion 16 of the barrel 11.

Then, a spring body 31 as a biasing means is inserted into the barrel 11 through the rear opening portion 15 of the barrel 11, and the front end of the spring body 31 contacts the rear end of the flange portion 25 of the plunger 21. The plunger 21 is pressed and biased forward.

Further, a cylindrical spacer 33 made of brass or the like is fitted into the barrel 11 through the rear opening 15 of the barrel 11, and the rear end of the spring body 31 is locked at the front end of the spacer 33. .. Further, the barrel 11 is crimped at a plurality of positions at the rear end of the spacer 33 to form a plurality of locking recesses 34, and the locking recesses 34 lock the rear end of the spacer 33. ..

Subsequently, a substantially cylindrical insulator 35 made of Duracon or the like is fitted into the barrel 11 through the rear opening 15 of the barrel 11. An annular locking portion 35a is provided at the rear end portion of the insulator 35 so as to project outward, and the locking portion 35a is locked at the rear end portion of the barrel 11.

A terminal 41 is fitted from the rear side into the fitting hole 38 formed in the shaft center portion of the insulator 35.

The terminal 41 has a substantially columnar shape made of copper-plated brass or the like and has a terminal portion 43 whose diameter is slightly increased at the rear portion from the locking step portion 42 formed in the middle portion. At the same time, a fitting recess 44 to which the fitting projection 26 of the plunger 21 is removably connected is formed in the axial center portion of the front end surface. In addition, a projection 44a is formed on the inner peripheral surface of the fitting recess 44 for more reliable connection.

Then, the terminal 41 is fitted into the fitting hole 38 of the insulator 35 from the rear side, and the plunger 21 is fitted with the locking step portion 42 locked to the rear end surface of the insulator 35. The projecting portion 26 and the front end portion of the terminal 41 face each other with a predetermined gap a therebetween, and the rear terminal portion 43 projects from the rear opening portion 15 of the barrel 11. There is.

Further, a socket or the like from which a lead wire (not shown) is drawn out is fitted and connected to the terminal portion 43.

Then, the insulator 35 is locked by a plurality of locking recesses 52 formed by crimping the rear peripheral surface of the barrel 11, and the terminal 41 moves the terminal 41 through the insulator 35. It is fixed to.

Next, the operation of the test using 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 protruding portion 18 is engaged and fixed. In addition, the lead wire connected to a measuring instrument or the like is connected to the terminal portion 43 of the terminal 41 through a socket.

When the probe board is held apart from the object to be measured and the tip end portion 22a of the measuring terminal portion 22 of the plunger 21 is not pressed against the object to be measured, the urging force of the spring body 31 is increased. The plunger 21 is pressed by the front side, and the fitting projection 26 of the plunger 21 and the front end of the terminal 41 are opposed to and separated from each other with a predetermined clearance a, and the plunger 21 and the terminal 21 are separated from each other. 41 and are insulated from each other.

Next, when the probe board is brought close to the object to be measured and the tip portions 22a of the plungers 21 of the respective spring probes are pressed against the object to be measured all at once, each plunger 21 is moved by the flange portion 25. The spring body 31 is compressed and retracts while resisting the biasing force.

In this state, a load of several tens of grams to 3000 grams is applied to the tip portion 22a of the plunger 21, and the strength test of the measured object can be performed.

When the tip portion 22a of the plunger 21 is further pressed against the object to be measured, the plunger 21 is further retracted, and the fitting protrusion 26 of the plunger 21 is fitted into the fitting recess 44 of the terminal 41 and widened. It is possible to make contact with each other in an area and obtain a reliable electrical connection between the plunger 21 and the terminal 41.

Therefore, by conducting a test current through the test circuit while ensuring electrical continuity as described above, the continuity test of the DUT can be performed.

Further, in the state where the probe board is brought close to the object to be measured as described above, when the electronic parts or the terminals of the electronic parts as the object to be measured are not attached, the tip 22a of the plunger 21 is Does not come into contact with the object to be measured, or even if it comes into contact with the object, the amount of movement is short, and the fitting projection 26 of the plunger 21 and the fitting recess 44 of the terminal 41 are held in a separated state. In this state, since the plunger 21 and the terminal 41 are held in an insulated state, it is possible to perform a strength test and a continuity test as well as a presence / absence test of electronic components and the like.

According to the spring probe of this embodiment, the strength of the object to be measured such as an electronic component, the presence / absence of the component, and the continuity test can be performed almost at the same time, so the number of measurements can be reduced. ..

Further, since the rear end of the plunger 21 is the fitting protrusion 26 having a sharp tip and the fitting recess 44 is formed at the front end of the terminal 41, when the plunger 21 is pressed against the object to be measured. The fitting projection 26 fits into the fitting recess 44 and contacts a wide area, and reliable electrical conduction can be obtained between the plunger 21 and the terminal 41. Further, since the terminal 41 has a simple structure and can be integrally formed, it is easy to manufacture and the diameter can be reduced, and the barrel 11 into which the terminal 41 is inserted can also be reduced in diameter.

Further, since the front opening 12 at the front end of the barrel 11 is crimped to a small diameter to form the locking portion 16, the front opening 12 that can reliably support the plunger 21 can be easily formed. The outer diameter of the tip portion of the barrel 11 can be reduced.

With the above structure, the outer diameter of the barrel 11 can be reduced to, for example, 1.0 mm or less. Therefore, the spring probes can be densely arranged on a probe board or the like, and it becomes possible to simultaneously conduct the continuity test of the DUT having a finer structure, and the measurement range can be expanded.

Further, since the protruding portion 18 that bulges in an annular shape is formed on the outside in the vicinity of the front end portion of the barrel 11, the barrel 11 is press-fitted and fixed in the mounting hole of the probe board (not shown), and the spring probe is attached. At the time of disposing, the projecting portion 18 elastically engages with the mounting hole of the probe board, and this spring probe can be more reliably fixed. Therefore, it is possible to prevent the spring probe from coming off from the mounting hole of the probe board, for example, due to an impact during a strength test.

[0040]

[Effect of the device]

 According to the spring probe of the first aspect, the strength of an object to be measured such as an electronic component, the presence / absence of the component, and the continuity test can be performed almost at the same time, so the number of measurements can be reduced. In addition, the rear end of the plunger is used as the fitting projection, and the fitting recess is formed so that it can be inserted into and removed from the front end of the terminal.When the plunger is pressed against the DUT, the fitting projection is Can be fitted into the fitting concave portion and come into contact with each other, so that reliable electrical conduction can be obtained between the plunger and the terminal. Moreover, since the terminal has a simple structure, it is easy to manufacture and the diameter can be further reduced.

According to the spring probe of the second aspect, in addition to the effect of the spring probe of the first aspect, since the overhanging portion is formed, the barrel is press-fitted and fixed in a mounting hole such as a probe board. Then, when the spring probe is arranged, the projecting portion elastically engages with the mounting hole of the probe board, and the spring probe can be more securely fixed. Also, since the front opening at the front end of the barrel is caulked to a small diameter to form the locking portion, a front opening that can securely support the plunger can be easily formed, and the outside of the tip of the barrel can be easily formed. The diameter can be reduced.

[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. 11 Barrel 12 Front opening 15 Rear opening 16 Locking part 18 Overhanging part 21 Plunger 22a Tip part 26 Fitting projection 31 Spring body 41 as biasing means 41 Termination 44 Fitting recess

Claims (2)

[Scope of utility model registration request] 1. A cylindrical barrel having a front opening and a rear opening, a conductive terminal fixed to the barrel with the rear opening inserted, and the front opening inserted. A conductive plunger elastically supported by a biasing means and provided on the barrel so as to be able to move back and forth, and the rear end portion of the plunger is normally separated from the front end portion of the terminal, and In a spring probe in which the rear end of the plunger contacts the front end of the terminal while the front end of the plunger is pressed backward, a fitting recess is formed at the front end of the terminal, and the plunger is A spring probe having a fitting protrusion that is detachably connected to the fitting recess at a rear end portion of the spring probe. 2. The spring probe according to claim 1, wherein the front opening of the barrel is crimped to a small diameter to form a locking portion, and an overhanging portion is provided on the outer peripheral surface of the barrel. A spring probe featuring.