JPH0533061U - probe - Google Patents

Abstract

(57) [Abstract] [Purpose] To the through hole which is the measured point of the circuit board,
Easy and stable insertion of a probe to derive an electrical signal. [Structure] A piston contactor 3 is attached to the tip of a rod-shaped piston 2. The cylinder contactor 4 is attached to the cylinder 1 side so that the contactor 3 is always kept in contact with the contactor 3. These two contacts 3 and 4 are constantly contacted by the action of the leaf spring 5. [Effect] At the time of insertion into the through hole, the tips of both contacts are aligned to form a round bar to facilitate insertion into the through hole. After the insertion, the cylinder contact can be fixed by the piston contact so as to be pressed against the inner peripheral surface of the through hole.

Description

[Detailed description of the device]

[0001]

【Technical field】

 The present invention relates to a probe, and more particularly to a probe that is used for connecting an electronic measuring instrument and a device under test and takes in an electric signal of the device under test into the electronic measuring instrument.

[0002]

[Prior art]

 The structure of a conventional probe is shown in FIG. The cylinder 1 is a hollow cylinder having one end closed and the other end open, and a rod-shaped piston 2 is slidably fitted in the hollow portion. A coil spring 6 is provided in the hollow portion so as to urge the piston 2 in a direction (arrow B) for pushing the piston 2 out of the hollow portion.

A contactor 8 for taking in an electric signal along the longitudinal center axis of the rod-shaped piston 2 is fixedly attached to the cylinder 1, and the electric signal is guided by a cable 7.

The tip of the contactor 8 projects slightly from the piston 2 and has a key-type contactor structure.

In this configuration, when the closed surface, which is the bottom surface of the cylinder 1, is pressed by the thumb, and the brim 9 provided at the substantially central portion of the piston 2 is pulled in the direction of arrow A by the index finger and the middle finger, the tip of the piston 2 is pulled. The hook-shaped contactor 8 further projects from the.

Therefore, by hooking the key portion of the contact 8 to a measurement point such as a lead of an electronic component and then releasing the finger, the biasing force (arrow B) of the coil spring 6 is applied to the cylinder 1 and the piston 2. In operation, the piston 2 grips and fixes the measuring point with the hook-shaped contactor 8.

Recently, the density of circuit boards has been remarkably increased with the use of surface mount devices. Since the leads of this surface mount device are short and the intervals are narrow, it is extremely difficult to connect the leads at the measurement points with the conventional probe having such a structure.

[0008] Therefore, a method has been adopted in which a test pin is set up in a through hole of a circuit board to connect a probe, but this method has a problem that it takes time.

[0009]

[The purpose of the device]

 An object of the present invention is to provide a probe that can take out a measurement signal in a short time by utilizing a through hole of a circuit board.

[0010]

[Device configuration]

 The probe according to the present invention comprises a hollow cylinder member having one end closed and the other end open, a rod-shaped piston member slidably fitted in the hollow portion, and a piston member mounted in the hollow to mount the piston member. A spring member for urging the hollow portion from the direction of pushing, a piston contact protruding from the tip of the piston member and fixedly attached to the piston member side, and fixed to the cylinder member side. The present invention is characterized by including a cylinder contactor which comes into contact with the piston contactor and receives an electric signal, and an elastic member which keeps the cylinder contactor and the piston contactor in a constant contact state.

[0011]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a view showing the structure of an embodiment of the present invention, and the same parts as those in FIG. 2 are designated by the same reference numerals. The positional relationship, structure and operation of the cylinder 1, the rod-shaped piston 2 and the coil spring 6 are the same as those shown in FIG.

A piston contact 3 is fixedly attached to the piston 2 so as to project at the tip of the piston 2. Further, the cylinder contactor 4 is fixedly attached to the cylinder side so that it is always in contact with the piston contactor 3, and when the cylinder contactor 4 comes into contact with the measured point (not shown), , The electric signal at the measured point is picked up and sent to the cable 7.

The cylinder contactor 4 is attached to the piston contactor 3 side so that the two contactors 3 and 4 are always in contact with each other (even when the piston 2 slides in the A and B directions). A U-shaped spring (leaf spring) 5 is attached as shown in the figure for biasing.

FIG. 3 shows an enlarged view of both the contacts 3 and 4, (a) is a side view and (b) is a sectional view taken along the line CC ′. The tip shape of both contacts 3 and 4 is a shape obtained by cutting a round bar diagonally in the longitudinal direction. When the tips of both contacts 3 and 4 are aligned, the round bar as shown in Fig. 4 is obtained. .

That is, the cross-sectional areas of the contact portions of the two contacts 3 and 4 are such that one gradually becomes larger toward the tip and the other becomes smaller.

The piston contactor 3 and the cylinder contactor 4 in this structure are as shown in FIG. When connecting the probe of the present invention to the through hole, first press the cylinder 1 with the thumb from the state shown in FIG. 2 and pull the collar 9 of the piston 2 with the forefinger and middle finger to move the piston contactor 3 in the A direction. The contacts 3 and 4 are inserted into the through holes 10 of the circuit board 11 as shown in FIGS. Incidentally, FIG. 4B is a sectional view taken along line DD ′ of FIG.

Next, the finger is released. The piston contactor 3 and the piston 2 move in the B direction by the elasticity of the coil spring 6. Here, the piston contactor 3 acts as a wedge for the through hole 10 and the cylinder contactor 4, and the contactor tightens the through hole 10 from the inner side as shown in FIG. 5, resulting in the probe. Is connected to the through hole 10. FIG. 5B is a sectional view taken along the line EE ′ of FIG.

[0019]

As described above, according to the present invention, a cylinder contactor that electrically contacts the through hole is provided at the tip of the probe, and the cylinder contactor can be fixed in the through hole. Therefore, there is an effect that the probe can be easily connected to the through hole in a short time, and the connection between the contactor and the through hole becomes close to surface contact, and the reliability is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of an embodiment of the present invention.

FIG. 2 is a diagram showing a structure of a conventional probe.

FIG. 3A is a side view showing a positional relationship between contacts at the tip of the probe, and FIG. 3B is a sectional view taken along line CC ′ of FIG.

FIG. 4A is a side view showing a positional relationship between contacts when inserting the tip of a probe into a through hole, and FIG. 4B is a sectional view taken along line DD ′ of FIG.

FIG. 5A is a side view showing the positional relationship between the contacts when the tip of the probe is completely inserted into the through hole;
(B) is the EE 'sectional view taken on the line.

[Explanation of symbols]

 1 Cylinder 2 Piston 3 Piston Contact 4 Cylinder Contact 5 Leaf Spring 6 Coil Spring 7 Cable 10 Through Hole 11 Circuit Board

Claims (2)

[Scope of utility model registration request] 1. A hollow cylinder member, one end of which is closed and the other end of which is open, a rod-shaped piston member slidably fitted in the hollow portion, and the piston member which is mounted in the hollow and which holds the piston member. A spring member for urging the hollow portion to push out, a piston contact protruding from the tip of the piston member and fixedly attached to the piston member side, and the piston contact fixed to the cylinder member side. A probe comprising: a cylinder contactor that comes into contact with a child and takes in an electric signal; and an elastic member that maintains the cylinder contactor and the piston contactor in a contact state at all times. 2. The cross-sectional area of each of the contact portions between the cylinder contact and the piston contact is such that one gradually becomes larger toward the tip and the other becomes smaller. The probe according to item 1.