JPH0333022Y2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Field of Industrial Application The present invention relates to a two-adapter type board inspection machine that inspects the connection state of circuit patterns on a printed circuit board.

(b) Conventional technology Conventionally, this type of inspection machine measures the resistance value between the contact probes by bringing contact probes into contact with a plurality of lands arranged on a board and applying a voltage to detect disconnections and short circuits. The contact probe can be classified into the following three types depending on the adapter in which the contact probe is installed.

In other words, there are so-called dedicated type inspection machines that use adapters with contact probes arranged on each board to accommodate multiple lands, and so-called general-purpose inspection machines that use adapters with contact probes arranged on all intersections of a grid. This is a so-called split general-purpose inspection machine that uses one elongated general-purpose adapter and feeds the adapter step by step to inspect the entire inspection area of the board.

However, there was a problem in that the cost was high because adapters had to be made individually. Also,
This method requires a large number of contact probes and is expensive, and it is also necessary to increase the contact pressure of the contact probes, which complicates the structure on the pressure side and causes problems with the inspection software. Furthermore, in the case of diagonal wiring, for example, there are many constraints on the board design, such as requiring a relay land within the area of the adapter, and in order to inspect the entire inspection area, the direction of the board must be changed by 90 degrees. There was a problem in that the test had to be performed twice, which was extremely time-consuming.

Furthermore, it is conceivable to adopt a two-adapter system in the split general-purpose inspection machine, but in order to realize this, it is necessary to drive the two adapters independently and have high stopping position accuracy.
Furthermore, there is a problem in that a vertical movement mechanism is required to bring the contact probe into contact with the printed circuit board, resulting in a very complicated structure.

(c) Purpose The present invention solves these problems and makes it possible to
A two-adapter type that allows you to easily and quickly inspect the entire inspection area by just setting it up once, and also allows you to control the adapter stop position with high precision, and to ensure good contact between the contact probe and the printed circuit board. The purpose is to provide a board inspection machine.

(D) Structure Therefore, the feature of the present invention is that a printed circuit board is set, and a table that is movable up and down on the base plate of the inspection machine body is moved horizontally above the table and the printed circuit board is placed on the board. a pair of adapters for inspecting the connection state of the circuit pattern by contacting the plurality of land portions arranged with a contact probe, and one end portion of the adapter includes:
The adapter is fixed to a nut screwed into a ball screw provided on the base plate, and is configured to be movable separately, and the other end of the adapter is attached to a plurality of holes of a positioning bar provided on the base plate. A cylinder is provided in which a rod is removably fitted, and after the adapter is positioned by the rod, the table is raised to bring the contact probe into contact with the land portion.

(E) Embodiments The present invention will be explained in detail below based on illustrated embodiments.

In Figures 1 to 3, 1 is the inspection machine main body 2
The table 3 is a rectangular base plate provided on the upper surface of the base plate 1, and a table 3 is disposed on the right side of the substantially center portion of the base plate 1 so as to be movable up and down.

Reference numerals 4 and 5 designate a pair of adapters, in which a guide member 8 fixed to the back side is fitted into a linear way 6 disposed on the upper part of the base plate 1, and each adapter can be moved independently using the linear way 6 as a guide. has been done. Then, the adapters 4 and 5 move above the printed circuit board 7 set on the table 3 via the board base 14, and bring the contact probes 9 into contact with a plurality of lands arranged on the printed circuit board 7. to inspect the connection status of the circuit pattern.

Specifically, the table 3 is connected to the tip of the rod 12 of the cylinder 11 via the support 10,
It is configured to be able to move up and down as the rod 12 reciprocates. Further, a plurality of inverted L-shaped stoppers 13 are fixed to the base plate 1 in correspondence with the outer peripheral edge of the table 3, and the notches 3a of the table 3 provided in correspondence with the stoppers 13 are fixed to the stoppers 13. 13, the rise of the table 3 is regulated to a predetermined height. The rising operation of this table 33 is as follows:
This is carried out after the adapters 4 and 5 have been horizontally moved (step fed) to a predetermined position.

15 and 16 are a pair of guide pins protruding from the back surface of the table 3;
are slidably inserted into the holes 17 and 18 formed in the base plate 1, respectively, and the table 3
This prevents rotation in the circumferential direction. Reference numeral 19 denotes a switch for detecting the vertical position of the table 3, and is provided in association with one of the guide pins 15. Note that a notch 20 is formed on the opposite side of the table 3 to facilitate mounting of the substrate base 14 on the table 3. Further, a U-shaped clamper 22 is pivotally attached to the table 3 so as to be swingable around a support shaft 22, and fixes the printed circuit board 7 set on the table 3 so that it does not shift.

Further, the base plate 1 is provided with a ball screw 24 parallel to the linear way 6, and a positioning bar 25 is provided on the opposite side. A plurality of holes 25a are formed in the approximately positioning bar 25 at predetermined intervals (the moving distance of the adapters 4 and 5 per one step).

On the other hand, the adapters 4 and 5 are provided with a plurality of contact probes 9 fixed to the insulating material 31 on the back surface of the main body 26 in the form of a strip plate through a reinforcing plate 27, and on the upper back surface of the main body 26, respectively. A nut 21 screwed into the ball screw 24, and the nut 2
1 with respect to the ball screw 24, and a cylinder 30 provided at the bottom of the back surface of the main body 26, into which the rod 29 is removably fitted into the hole 25a of the positioning bar 25. We are prepared. After this fitting operation of the rod 29,
Table 3 begins to rise. Note that a guide piece 42 is provided so that the rod 29 vertically descends and fits accurately into the hole 25a.

Specifically, the contact probe 9 is fixed to an insulating material 31 such as glass epoxy, and the main body 2 is attached by attaching the insulating material 31 to the reinforcing plate 27.
It is located at 6. Further, the contact probes 9 are arranged at predetermined intervals (for example, 2.54 mm intervals) and are always urged downward by a spring (not shown) to ensure a predetermined contact pressure.
Note that when the adapters 4 and 5 are adjacent to each other, in order to prevent the main bodies 26 from colliding with each other first and the distance between the adjacent probes deviating from a predetermined dimension, the opposing edge sides of the insulating material 31 are slightly smaller than the main body 26. It stands out.

Further, a timing belt 34 is suspended between the pulse motor 28 and the pulleys 32 and 33 of the nut 21, and the power of the pulse motor 28 is transferred to the nut 21.
1, and the adapters 4 and 5 can be moved left and right.

Further, an L-shaped guide piece 35 is vertically provided at the end of the main body 26 on the cylinder 30 side, and the guide portion 25 projects outward from the side of the positioning bar 25.
The bent portion 35a of the guide piece 35 engages with the portion b to prevent the adapters 4 and 5 from being pushed up as the table 3 rises.

36 and 37 are photo interrupters for slowing down and stopping, and the pair of photo interrupters 36 and 37 connect brackets 38 to two predetermined positions below the ball screw 24 and one of the adapters 5, respectively. It is attached through. In the example shown, adapter 5 is inserted from the right side.
For the photo interrupter 36, 37, a light shielding plate 39 is provided on the adapter 4, 5 side corresponding to the photo interrupter 36, 37, respectively. These photo interrupters 36 and 37 cause the adapters 4 and 5 to stand by at the test start position X.

Further, a disk 41 is provided on the drive shaft 28a of the pulse motor 28 in association with the photo interrupter 40 of the main body 26, and the drive shaft 28a of the pulse motor 28, the rod 29 of the cylinder 30, and the cylinder 11 are controlled based on control signals from a personal computer/sequencer (not shown). Rod 1
2 is activated and the adapters 4, 5 and table 3 are moved according to a preset program, thereby inspecting the entire inspection area of the printed circuit board 7.
Note that the operation of the adapters 4 and 5 is set to move the inspection area in one direction (to the right in the figure) immediately before the inspection between the land portions of the printed circuit board 7, taking into consideration the backlash of the ball screw 24. has been done. Further, when both adapters 4 and 5 are adjacent to each other, the distance between the contact probes 9 in the adjacent portions is smaller than that of the other contact probes 9.
They are arranged so that the dimensions are approximately the same as the spacing (2.54±0.05mm).

Next, an example of the use of the two-adapter type board inspection machine of the present invention will be explained based on FIG. 4.

(1) The adapters 4 and 5 are retracted to the left side as shown in FIG. 1 in order to set the printed circuit board 7 on the table 3.

(2) After setting the printed circuit board 7, first, the adapters 4 and 5 move to the inspection starting position An examination is performed (Figure 4a).

(3) Based on the inspection completion signal, the table 3 is lowered, and the adapter 4 is in a waiting state at the position (2).
The adapter 5 is moved one step at a time to the right in the figure, and an inspection is performed each time (FIG. 4b).

(4) When the adapter 5 finishes inspecting the rightmost end of the printed circuit board 7, the adapter 5 returns to the state shown in (2) (FIG. 4c).

(5) After the adapter 5 moves one step to the right, the adapter 4 follows and both adapters 4,
5 is close to each other and moved one step to the right from state (2). An inspection is performed in this state (Fig. 4d).

(6) From this state, adapter 4 remains on standby,
Adapter 5 moves one step to the right,
Inspections are carried out each time (Fig. 4e). Similar to the above, when the adapter 5 finishes inspecting the rightmost part,
The adapter 5 returns to the state (5) (FIG. 4f).

(7) By repeating the above operation, adapter 4,
5 inspects the entire inspection area of the printed circuit board 7 (Fig. 4g), and the adapters 4 and 5
It retreats to the state shown in the figure and prepares for the next inspection of the printed circuit board 7.

It is also possible to apply the adapters 4 and 5 of the present invention to the universal head section of an in-circuit tester, and to inspect the board after mounting components in the same manner. Furthermore, it is also possible to install a visual sensor in place of the contact probe 9 to inspect film originals and the like.

(f) Effects Since the present invention is configured as described above, the board can be
In addition to being able to easily and quickly inspect the entire inspection area by simply setting it up once, it is also inexpensive and has fewer contact probes compared to conventional general-purpose machines, requiring less contact pressure to the printed circuit board. The structure on the pressure side can be simplified. Furthermore, the stopping position of the adapter can be controlled with high precision, and good contact between the contact probe and the printed circuit board can be obtained, so there is no risk of inspection errors.

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention;
3 is a cross-sectional side view of the same, FIG. 3 is a cross-sectional front view of the adapter, and FIG. 4 is an explanatory diagram of the inspection procedure. 1...Base plate, 2...Inspection machine body, 3
...Table, 4, 5...Adapter, 7...Printed circuit board, 9...Contact probe, 21...
Nut, 24... Ball screw, 25... Positioning bar, 25a... Hole, 29... Rod, 30...
…Cylinder.

Claims (1)

[Scope of utility model registration request] A printed circuit board is set, and a contact probe is moved horizontally above the table provided on the base plate of the inspection machine body so as to be movable up and down, and the contact probe is brought into contact with a plurality of lands arranged on the printed circuit board. a pair of adapters for inspecting the connection state of the circuit pattern, and one end of the adapter is fixed to a nut screwed into a ball screw provided on the base plate, and each is configured to be movable separately. The other end of the adapter is provided with a cylinder in which a rod is removably fitted into a plurality of holes of a positioning bar provided on the base plate, and after the adapter is positioned by the rod, A two-adapter type board inspection machine, characterized in that the table is raised so that the contact probe comes into contact with the land portion.