JPH03579B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printed board support device for probing the top surface of a printed board with components mounted on the top surface and wires congested on the bottom surface for electrical testing. be.

When testing the circuit of a printed circuit board with many components such as large integrated circuits (LSI) mounted on the top surface,
A widely used method is to place a printed circuit board almost horizontally and press the tip of a needle-shaped conductor from above the printed board into contact with the leads of the mounted components to perform so-called probing to configure and test the test circuit. It is being done.
In this case, since pressure is applied from above, the printed board will bend. If the printed board bends, the contact between the needle-shaped conductor and the lead part of the component will be incomplete, and in extreme cases, the internal pattern of the printed board may be damaged. Horizontal support is important.

Conventionally, as a device to support this without bending, the four edges of the printed board are tightly fixed in the opening of a box-shaped case with a bottom, and the desired amount of compressed air is blown into the case, and the upper surface of the printed board is A device that balances the external pressure and eliminates deflection, and a column-shaped pin that supports the bottom of the printed board is firmly planted in the lower part of the box-shaped frame that supports the edge of the printed board. There was a device to support it so that it would not bend.

However, in the former case, compressed air is sealed inside the housing, which not only increases the cost of the device, but also requires complicated work to plug the through holes in the printed circuit board.
In the latter case, since the pins are fixed, there is a risk that the pins may press against the wire connections and damage the printed circuit boards with different wiring conditions on the back side.

In view of the above-mentioned conventional problems, an object of the present invention is to provide a print board that supports a printed board without bending with a relatively simple structure and without damaging the printed board by making the pins that support the lower surface of the printed board movable. An object of the present invention is to provide a plate support device.

In order to achieve the above object, the present invention provides a printed board support device that supports the edge of a printed board 1 when probing and testing a mounted printed board, as shown in FIGS. 1 to 3. a box-shaped main body 5 with a frame-shaped opening around the upper surface; and a guide section 10 in which a frame-shaped rib 11 fixed to the lower part of the main body 5 and having a T-groove 11' and a rectangular cross section is formed diagonally. and a T-slot 12' along the longitudinal direction,
A nut guide member 12 is provided which is fixed to the guide portion 10 by bringing the opening surface of the T-groove 12' into close contact with the upper surface of the rib 11.

In order to support a desired position on the lower surface of the printed board 1 at the tip, the head is attached to the T-groove 1 of the rib 11.
A plurality of screw-shaped pins 8 are attached to the guide portion 10 so as to be slidable in the longitudinal direction of the rib 11 by being fitted into the guide portion 1′.

On the other hand, it is possible to slide inside the T-groove 12' of the nut guide member 12 while being screwed into the threaded portion of each pin 8, and by screwing the pin 8, the lower surface is pressed against the upper surface of the rib 11. Then, connect pin 8 to rib 1
A rectangular nut 7 fixed at a desired position on the nut guide member 12 is attached to the nut guide member 12. The present invention will be described in detail below with reference to illustrated embodiments.

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the chain line M in FIG. 1, and FIG. 3 is a perspective view of the device shown in FIG.

In FIGS. 1, 2, and 3, reference numeral 1 denotes a printed board on which a large number of LSI components 2 are mounted and connected through leads 2' on the upper surface, and wires 3 are congested and wired on the lower surface. 4 is a needle-shaped conductor that applies pressure from above to each lead 2' of the LSI component 2 to be tested.
It is contacted and probed, and is connected to a tester (not shown). Note that the pressing force on one conductor 4 is approximately 100 g, and since 80 conductors 4 are probed at most, the printed board 1 is partially subjected to a force of 8 kg from above, causing it to bend.

5 is a box-shaped main body with a predetermined upper surface shape larger than the printed board 1 with open upper and lower parts, and the four peripheral edges of the printed board 1 are placed on the frame-shaped upper surface 5';
A plate-shaped mounting plate 6 is fixed to the main body 5 from above with machine screws 6', and clamps and fixes opposing edges of the printed board 1. Note that the mounting plate 6 is formed with a protrusion 6'' of a predetermined height, and the printed board 1
Even if it is turned upside down after being fixed to the main body 5, the components mounted on the printed board, such as the LSI component 2, will not be damaged.

Reference numeral 10 denotes a rectangular frame-shaped guide portion that is inserted into a rectangular groove 5'' in the lower part of the main body 5 and is fixed to the main body 5 with machine screws 9.

The guide portion 10 is provided with diagonal ribs 11 each having a T-groove 11' and having a rectangular cross section. This T
The groove 11' is an inverted T-shaped groove into which the head of a pin 8, which will be described later, is inserted and the screw portion passes upwardly, allowing the pin 8 to slide in the horizontal direction.

12 has a T-slot 12' along the longitudinal direction,
The nut guide member is fixed to the top of each rib 11 with the opening surface of the T-groove 12' in close contact with the top surface of the rib 11.

The T-slot 12' of the nut guide member 12 is connected to a rectangular nut 7, which will be described later, and which is screwed into the threaded portion of the pin 8.
This is an inverted T-shaped groove that allows the pin 8 to slide in the horizontal direction when the pin 8 is accommodated and the pin 8 penetrates upward.

8, the head is inserted into the T groove 11' of the rib 11,
It is a machine screw-shaped pin that can be slid to a desired position in the longitudinal direction of the rib 11.

7 is a nut guide member 1 on two opposing sides of a square shape, which is screwed into the threaded portion of each pin 8.
This is a rectangular nut that can slide within the T-groove 12' in the longitudinal direction of the groove without rotating by sliding on the inner wall of the T-groove 12' of No. 2.

Move such a pin 8 to a desired position on the rib 11, and then screw the pin 8 to press the lower surface of the rectangular nut 7 against the upper surface of the rib 11, and move the pin 8 to the desired position on the rib 11. Fixed in position.

At this time, the pin 8 has a predetermined length such that its tip end matches the lower surface of the printed board 1 in an unflexed state when it is fixed to the rib 11.

Since the support device of the present invention has the above-described structure, after fixing the printed board to the main body 5, place it upside down or on its side, select a desired location other than the connection part of the wire 3 on the bottom surface of the printed board 1, and attach the tip of the pin 8. can be brought into contact and supported.

As explained above, the present invention includes a frame-shaped main body on which a printed board is mounted, a guide portion having diagonal ribs provided at the lower part thereof, and a nut guide member having a T-groove attached to the upper surface of the rib. , the flat nut that is screwed onto the pin is connected to the T of the nut guide member
The pin is housed in the groove, moved and fixed to a desired position on the rib, and the tip of the pin is brought into contact with the bottom surface of the printed board, resulting in a relatively simple structure and low cost. This printed board support device is capable of supporting a printed board without bending without damaging the printed board, and has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is a partial sectional view taken along the chain line M in FIG. 1, and FIG. 3 is a perspective view of FIG. 1 viewed from below. In the figure, 1 is a printed board, 2 is an LSI, 3 is a wire, 4 is a conductor, 5 is a main body, 6 is a mounting plate, 7 is a rectangular nut, 8 is a pin, 10 is a guide part, 11 is a rib, 11' is a T groove, 12 is a nut guide member, 1
2' indicates a T-groove, respectively.

Claims (1)

[Scope of Claims] 1. A printed board support device for probing and testing a mounted printed board, comprising: a box-shaped main body 5 with a frame-shaped opening around the top surface supporting the edge of the printed board 1; It has a frame shape that is fixed to the lower part of the main body 5, and has a T-slot 1.
1', a rib 11 having a rectangular cross section has a guide portion 10 formed diagonally, and a T groove 12' along the longitudinal direction, and the T groove 1
The opening surface of 2' is brought into close contact with the upper surface of the rib 11,
A nut guide member 12 fixed to the guide portion 10
The head is fitted into the T-groove 11' of the rib 11 so that the tip supports a desired position on the lower surface of the printed board 1, so that it can be slid in the longitudinal direction of the rib 11. A plurality of machine screw-shaped pins 8 are attached to the guide portion 10, and the nut guide member 12 is slidably movable within the T-groove 12' while being screwed into the threaded portion of each of the pins 8. A printed board support device comprising a rectangular nut 7 whose lower surface is pressed against the upper surface of the rib 11 so that the pin 8 is fixed at a desired position on the rib 11.