JPS6213026Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel printed circuit board inspection device. In particular, a contact pin connected to an appropriate test circuit is brought into contact with a conductive foil pattern formed on a printed circuit board to check the connection state of the conductive foil pattern and whether or not the printed circuit board has been formed correctly. The present invention aims to provide a novel printed circuit board inspection device that eliminates inspection errors by bringing contact pins into reliable contact with a conductive foil pattern or the like.

Figure 1 shows an example of a conventional printed circuit board inspection device.
This shows that. Reference numeral b denotes a frame body, which is reciprocated in the direction shown by the arrow by a drive mechanism such as an air cylinder c. A holding block d made of an insulating material is provided at the tip of the frame b, and a plurality of contact pins e, e, . . . are slidably held on this holding block d. Then, when the frame body b is moved toward the printed circuit board f to be tested, the tips of the contact pins e, e, . , contact pins e, e, .

In the above-mentioned printed circuit board inspection device, the contact pins e, e, ... are brought into pressure contact with the conductor foil pattern, etc. on the printed circuit board f to be tested by a resilient means (not shown). Although,
Sometimes, the contact parts on the printed circuit board under test may have flux or other foreign matter attached to them during soldering, and in such cases, the contact pins e, e,... If only the contact pins are pressed against the board f, the contact pins e, e, etc. may be blocked by flux, etc., and may not be able to come into contact with the conductor foil pattern, etc., and therefore, correct inspection cannot be performed. Something happened.

Therefore, the present invention has been devised in view of the above-mentioned conventional drawbacks, and is a novel printed circuit board inspection device in which the contact pins can destroy flux etc. and come into direct contact with conductor foil patterns etc. It is intended to provide a contact pin which is elastically biased in a fixed direction and slidable on a holding body, and stores the elastic force of the means for elastically biasing the contact pin, and the elastic force of the means for elastically biasing the contact pin is stored. It is characterized by being equipped with a means for instantly releasing the elastic force.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of the printed circuit board inspection apparatus according to the present invention will be described below with reference to illustrated embodiments.

2 to 4 show an example 1 of the printed circuit board inspection apparatus of the present invention.

Reference numeral 2 denotes a frame body, which is fixed to the tip of the piston rod 4 of the air cylinder 3, and is adapted to be moved toward and away from the printed circuit board f to be tested held by a suitable jig. A holding block 5 is a part of the frame body 2, and is made of a suitable insulating material, and a plurality of contact pins 6, 6, . . . are slidably held in the holding block 5.

The contact pins 6, 6, . . . are held in the holding block 5, for example, as shown in FIG.
The contact pin 6 is made of a conductive material, has a tip 7 having a substantially conical point, and has a narrow diameter portion 9 up to the middle except for the base end 8. A holding hole 10 is formed in the holding block 5 passing through it in the thickness direction, and the sleeve 1 is inserted into this holding hole 10.
1 is fitted and fixed, and a flange 12 protruding inward is formed at the upper end of this sleeve 11, that is, on the side opposite to the printed circuit board to be tested. The narrow diameter portion 9 of the contact pin 6 is inserted into the sleeve 11, the base end 8 is positioned above the flange 12, and the base end 8 is engaged with the flange 12. , the contact pin 6 is prevented from falling off from the holding block 5. In order to insert the contact pin 6 into the sleeve 11 in this way, the contact pin 6 is actually formed in two parts, for example, the base end part 8 and the other part, and the narrow diameter part is formed into two parts. 9 must be passed through the flange 12 portion, and then the proximal end portion 8 must be connected thereto by suitable means such as threaded connection. Reference numeral 13 denotes a coil spring that is fitted onto the narrow diameter portion 9 of the contact pin 6 and compressed between the flange 12 of the sleeve 11 and the shoulder portion 14 located at the boundary between the tip side of the narrow diameter portion 9. Therefore, the contact pin 6 is always resiliently biased in the direction shown by the solid arrow in FIG. 4, that is, toward the printed circuit board f to be tested.

15 is a stopper plate interposed between the frame body 2 and the printed circuit board f to be tested, and has a plurality of holes 16, 1 through which the contact pins 6, 6, . . . are inserted.
6,... are formed. Reference numeral 17 denotes an air cylinder, and the tip of the piston rod 18 is connected to one end of the stopper plate 16. By driving this air cylinder 17, the stopper plate 15 is moved in a direction perpendicular to the moving direction of the frame body 2. It is starting to be moved to

19 is a test circuit, and each contact pin 6, 6,...
... is connected to this test circuit.

The printed circuit board f is inspected by the printed circuit board inspection apparatus 1 as described above in the following manner. First, the printed circuit board f to be tested is set at a predetermined location, and the stopper plate 15 is opened as shown in FIG. 2, that is, the holes 16, 16, . . .
The position of the contact pins 6, 6, . . . is shifted from the position of the contact pins 6, 6, . urge Then, the tips 7, 7, . . . of the contact pins 6, 6, . . . eventually come into contact with the stopper plate 15. Even so, when the frame body 2 is still moved, the contact pins 6, 6, .
The elastic force of the springs 13, 13, . . . is stored (see Fig. 2). Then, when the frame body 2 has been moved to a predetermined position, the air cylinder 17 is driven to move the stopper plate 15 to the second position.
When moved in the direction shown by the dashed-dotted line arrow in the figure, the holes 16, 16, . . . of the stopper plate 15 and the positions of the contact pins 6, 6, . Since there is nothing blocking the forward movement of ... toward the test printed circuit board f, the stored elastic force of the springs 13, 13, ... is released all at once, and as a result, the contact pins 6, 6, …
... are respectively caused to collide with predetermined locations on the printed circuit board f to be tested. Therefore, foreign matter such as flux is destroyed by the impact force at that time, and the tips 7, 7, . . . of the contact pins 6, 6, . It will be done.

FIG. 5 shows a modification of the printed circuit board inspection apparatus of the present invention. In this modification, a narrow diameter portion 19 is formed at the tip of the contact pin 6a, and a step portion 21 is formed between the narrow diameter portion 19 and the main portion 20. Further, the tip of the narrow diameter portion 19 is a pointed tip 22 . On the other hand, a keyhole-shaped hole 23 is formed in the stopper plate 15a, and a large diameter portion 24 of the hole 23 is connected to the contact pin 6a.
The small diameter portion 25 is formed to have a width smaller than the diameter of the main portion 20 of the contact pin 6a, and larger than the diameter of the small diameter portion 19, so that the main portion 20 of the contact pin 6a can be inserted therethrough.

Thus, the contact pin 6a is connected to the printed circuit board f to be tested.
Before contacting the conductor foil pattern h etc., as shown in FIG.
5 and engages the stepped portion 21 with the edge of the small diameter portion 25, thereby preventing the contact pin 6a from advancing toward the printed circuit board f to be tested and reducing the elasticity associated with the contact pin 6a. It is designed to store the explosive power of the firing means. In this modification, the resilient means for biasing the contact pin 6a may be the same as the spring 13 described above, and the manner in which it is related to the contact pin 6a is also the same as that in the previous embodiment. That's fine.

When the elastic force of the elastic means associated with the contact pin 6a is accumulated, the stopper plate 1
5a in the direction shown by the arrow in FIG. , it advances all at once toward a predetermined location on the printed circuit board f to be tested, and its peak 22 collides with a predetermined location i on the printed circuit board f to be tested. Therefore, the contact pin 6a can reliably come into contact with the predetermined location i of the printed circuit board f to be tested.

FIG. 6 shows another embodiment of the printed circuit board inspection apparatus of the present invention. In this modification, the contact pin 6b has a narrow diameter portion 26 at a portion slightly closer to the pointed end from its base end (on the opposite side to the pointed end), and a flange 27 having a larger diameter than the narrow diameter portion 26 is formed at the base end. has been done. A flange 28 is also formed in the middle portion of the main portion, and the tip thereof is a pointed tip 29.

The stopper plate 15b is formed with a keyhole-shaped hole 30 similar to that in the above-described modification, and the large diameter portion 31 thereof is formed to have a larger diameter than the diameter of the flange 27 formed at the base end of the contact pin 6b. Further, the width of the small diameter portion 32 is larger than the diameter of the small diameter portion 26 of the contact pin 6b, and smaller than the diameter of the flange 27.

As shown in FIG. 6, before the contact pin 6b is brought into contact with the conductive foil pattern or the like of the printed circuit board to be tested, the small diameter portion 26 of the contact pin 6b is inserted into the small diameter portion 32 of the hole 30 of the stopper plate 15b. , and engages the flange 27 with the edge of the small diameter portion 32, thereby preventing the contact pin 6b from advancing. Then, when the elastic force of the elastic means associated with the contact pin 6b is accumulated, the stopper plate 1
5b in the direction shown by the solid line arrow in FIG. 6 to align the axis of the contact pin 6b with the center of the large diameter portion 31, the accumulated elastic force is released at once, and the contact pin 6b , and is forced to advance vigorously in the direction shown by the dotted arrow in FIG. Although the springing means is not shown, for example, a coil spring may be incorporated into the holding block 5 so that the flange 28 near the tip of the contact pin 6b inserted through the holding block 5 receives the pressing force of the spring. Therefore, a resilient means can be associated with the contact pin 6b. Further, in this modification, the stopper plate 15b is arranged on the side of the holding block 5 opposite to the printed circuit board to be tested.

As is clear from the above description, in the printed circuit board inspection device of the present invention, a contact pin that is slidably biased in a fixed direction is provided on the holder, and By storing the elastic force of the elastic means and releasing it instantaneously, the contact pins collide with a certain impact force at a predetermined location on the printed circuit board to be tested. Even if there is foreign matter such as flux attached to the place that should be contacted, destroy it and
The conductor foil pattern underneath can be contacted, and erroneous inspections due to poor contact can be eliminated.

In the above embodiment, the stopper plate is used as a means for accumulating the elastic force of the elastic means associated with the contact pin and releasing it all at once, but this may also be done electromagnetically. That is, the contact pin is pulled upward by an electromagnet, and then,
When the power to the electromagnet is cut off, the contact pin collides with the printed circuit board under test due to the stored elastic force.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a conventional printed circuit board inspection device, FIGS. 2 to 4 show an example of implementation of the printed circuit board inspection device of the present invention, and FIG. FIG. 3 is a side view of the contact pin in contact with the test printed circuit board, FIG. 4 is an enlarged cross-sectional view of the contact pin holder, and FIG. 5 is the present invention. FIG. 6 is an enlarged perspective view showing the main parts of a modified example of the printed circuit board inspection device, in which FIG. A shows a state in which the contact pin is prevented from moving, and FIG. FIG. 6 is an enlarged perspective view of main parts showing another modification of the printed circuit board inspection apparatus of the present invention. Explanation of symbols, 1... Printed circuit board inspection device, 5
... Holding body, 6, 6a, 6b ... Contact pin, 13
...Bulging means, 15, 15a, 15b...Means for accumulating and releasing elastic force.

Claims (1)

[Scope of utility model registration request] A contact pin that is elastically biased in a fixed direction while being slidable on a holding body and a means for elastically biasing the contact pin store elastic force, and instantly release the stored elastic force. A printed circuit board inspection device comprising: means.