JP3014055B2 - Electrical check device for printed wiring boards - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electrical check device for a printed wiring board for inspecting electrical continuity of a printed wiring board.

(Prior art)

In order to inspect the electrical continuity of a large number of conductive patterns provided on a printed wiring board, it is necessary to set an upper check plate and a lower check plate that are different for each printed wiring board in an elevating device.

That is, in the conventional electrical check device for printed wiring boards, the upper check plate 92 and the lower check plate 93 are separately fixed to the elevating device 91 as shown in FIG.

In this fixing, positioning of the upper check plate 92 and the lower check plate 93 in the front-rear direction (X), the left-right direction (Y), and the turning direction (θ) is performed with respect to the elevating device 91 by a try and error.

Although not shown, in a conventional electrical check device for a printed wiring board, the positioning of the upper check plate 92 and the lower check plate 93 may be performed using the positioning pins of the elevating device 91.

In this case, after the lifting / lowering device 91 is temporarily stopped, the upper check plate 92 and the lower check plate 93 are positioned. Then, the upper check plate 92 and the lower check plate 93 are fixed to the lifting device by the fixing bolts.
When inspecting different types of printed wiring boards, the fixing bolts are removed each time, and the upper check plate and the lower check plate are replaced.

The upper check plate 92 and the lower check plate 93
, Probe needles 940 are respectively implanted so as to be able to advance and retreat. The probe needle 940 is connected to the continuity tester 94.

At the time of inspection, the upper check plate 92 and the lower check plate 93 are moved up and down by the up and down movement of the lifting / lowering device 91, and the probe needle
940 is brought into contact.

[Problem to be solved]

However, in the conventional electrical check device for a printed wiring board, the upper check plate 92 and the lower check plate 93 must be separately fixed to the elevating device 91. Then, the positioning of both check plates in the X, Y, and θ directions is performed by trial and error. In other words, it is not possible to make an external setup for the device and positioning of the two check plates.

Also, when positioning the upper check plate and the lower check plate using the positioning pins of the elevating device, the outer setup cannot be performed and the elevating device needs to be stopped. For this reason, the stopping time of the lifting device is prolonged, and the workability is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and has as its object to provide an electrical check device for a printed wiring board, in which an upper check plate and a lower check plate can be set easily in a short time.

[Solutions to solve the problem]

The present invention comprises a lifting device, a cassette-type checker head that can be attached to and removed from the lifting device in a lateral direction, and a stripper plate disposed at the center of the checker head and fixed to the lifting device. Further, the checker head is an electric check device for a printed wiring board, wherein a probe needle connected to a continuity tester is implanted. The checker head comprises a lower base having a lower check plate and an upper base having an upper check plate, and a ball which guides up and down movement between the lower base and the upper base. A guide post is provided, and the probe needle is implanted on each of the upper and lower check plates so as to be able to advance and retreat. The stripper plate has guide pins for positioning the printed wiring board, and is configured to be located between the upper check plate and the lower check plate when the checker head is mounted on the elevating device. Then, the lower check plate and the upper check plate are moved up and down via the lower base and the upper base by the up and down movement of the lifting / lowering device, so that the probe needle is brought into contact with the printed wiring board on the stripper plate.

Most notable in the present invention is a cassette comprising a lower base having a lower check plate and an upper base having an upper check plate, wherein the lower guide and the upper base are vertically moved by a ball guide column. Type checker head,
The checker head is disposed so as to be detachable in the horizontal direction with respect to the lifting device.

In the present invention, at least two ball guide columns are provided. The ball guide pillar may be provided on the lower base side (see the embodiment) or may be provided on the upper base side. Further, a sub-guide can be provided outside the ball guide column (see the embodiment).

The ball guide column is a guide column in which a number of sliding balls are freely rotatably moored on an outer peripheral portion.

In this example, it is desirable to provide a positioning pin, a positioning guide, and the like for positioning the lower check plate and the upper check plate with respect to the lower base and the upper base.

Further, it is desirable to arrange a pilot pin for positioning the printed wiring board on the upper check plate or the lower check plate (see the embodiment).

When the upper check plate is lifted after the inspection, the upper check plate side may be elastically supported with an upper stripper plate for protecting the probe needles and preventing the printed wiring board from being lifted. desirable.

The probe needle is an inspection needle for making contact with a through hole or the like in the conductor pattern of the printed wiring board.

(Operation)

In the present invention, the lower check plate and the upper check plate are positioned and attached to the lower base and the upper base of the checker head with the checker head removed from the lifting device. That is, external setup is performed.

Then, the checker head is mounted on the lifting device from a lateral direction.

Thereafter, the continuity test of the printed wiring board is performed by operating the lifting device.

At this time, the lower base and the upper base are moved up and down by being guided by the ball guide pillars by the up and down movement of the elevating device. Further, the lower check plate and the upper check plate move up and down via the lower base and the upper base. Then, probe needles provided on the upper and lower check plates are brought into contact with the upper and lower sides of the printed wiring board on the stripper plate.

When the probe needle comes into contact with the printed wiring board, power is supplied from the continuity tester to the printed wiring board via one of the probe needles. Then, a current flows through the probe needle on the opposite side. At this time, no current flows through the conductive pattern having a defect, and the defect is detected. Thus, the electrical continuity of the printed wiring board is inspected.

Thereafter, the probe needle is separated from the printed wiring board by the vertical movement of the lifting device. Then, the inspected printed wiring board is discharged, and the printed wiring board to be inspected next is transported onto the stripper plate. At this time, the printed wiring board is sent while being positioned by the guide pins.

In this way, the continuity test of the printed wiring board is sequentially performed.

(Effect)

As described above, according to the present invention, external setup can be performed using a cassette type checker head.

Therefore, according to the present invention, the check plate can be set easily in a short time. An electric check device for a printed wiring board can be provided.

〔Example〕

An electrical check device for a printed wiring board according to an embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1 and FIG. 2, the electric check device of the present embodiment includes an elevating device 1, a cassette-type checker head 2 that can be detachably mounted on the elevating device 1 in a lateral direction, and a A stripper plate 31 is provided at the center and fixed to the lifting device 1. A probe needle 41 connected to the continuity tester 4 is implanted in the checker head 2.

The checker head 2 has a lower base 2 having a lower check plate 210, as shown in FIGS.
1 and amper base 22 with upper check plate 220
Consists of Further, between the lower base 21 and the upper base 22, a ball guide column 231 for guiding the vertical movement of both is provided.

The probe needles 41 are implanted on the upper check plate 220 and the lower check plate 210, respectively, so as to be able to advance and retreat.

The stripper plate 31 is used for the printed wiring board 8.
When the checker head 2 is mounted on the lifting device 1 with the guide pin 311 for positioning the
It is configured to be located between the upper check plate 220 and the lower check plate 210.

Then, as shown in FIG. 4, the lower base 21 and the upper base 22 are moved by the vertical movement of the elevating device 1.
The lower check plate 210 and the upper check plate 220 are moved up and down via, so that the probe needle 41 is brought into contact with the printed wiring board 8 on the stripper plate 31.

As shown in FIG. 1, the elevating device 1 has a lower moving table 11 and an upper moving table 12 that move up and down in opposite directions. A hydraulic device (not shown) for vertically moving the moving tables 11 and 12 is connected to the moving tables 11 and 12.

Further, on both sides of the elevating device 1, a loading device 51 and a discharging device 52 for the printed wiring board 8 are provided.

The stripper plate 31 is, as shown in FIG.
It is fixed to the frame 10 of the elevating device 1 in correspondence with the height positions of the charging device 51 and the discharging device 52.

The checker head 2 comprises a lower base 21 and an upper base 22, as shown in FIGS. The lower base 21 and the upper base 22 are each formed in a convex shape, and the lower check plate 210 and the upper check plate 220 are attached to the protruding opposing surfaces. The lower check plate 210 and the upper check plate 220
Positioning is performed by positioning pins 25 projecting from the lower base 21 and the upper base 22.

As shown in FIG. 4, the probe needle 41 and the pilot pin 211 for positioning the printed wiring board are implanted in the lower check plate 210.

In the stripper plate 31, a pin hole 312 and a needle hole 314 for inserting the probe needle 41 and the pilot pin 211 are formed. The guide pins 311 are arranged on the stripper plate 31 at regular intervals along the direction in which the printed wiring board 8 is conveyed.

The probe needle 41 is implanted in the upper check plate 220. On the lower surface of the upper check plate 220, as shown in FIG. 2 and FIG.
32 is elastically supported. As shown in FIG. 4, the upper stripper plate 32 has
A pin hole 321 and a needle hole 324 for inserting the guide pin 311 and the probe needle 41 are formed.

As shown in FIG. 5, the probe needle 41 includes a cylindrical case 411 having a bottom, a needle body 412 inserted and retracted into the case 411, and a spring 413 for elastically supporting the needle body 412. Consists of Needle body 412
Is the needle head 41 for contacting the printed circuit board.
Has zero. The probe needle 41 is connected to the continuity tester 4 via a lead wire 414.

Next, as shown in FIG. 2, the ball guide column 231 erected on the lower base 21 has a large number of sliding balls 233 moored at its tip so as to be freely rotatable. In addition, a guide tube 232 for slidably inserting the ball guide column 231 is provided on the upper base 22.

Further, a sub-guide 242 for assisting the ball guide post 231 is provided on the upper base 22 so as to project downward near the center thereof. The lower base 21 has a guide hole 241 through which the sub-guide 242 is slidably fitted.
Is engraved.

 In FIG. 2, reference numeral 26 denotes a knock pin.

Since the electric check device of the present embodiment is configured as described above, it exhibits the following operational effects.

That is, when setting the upper check plate 220 and the lower check plate 210 in accordance with the printed wiring board 8 to be inspected, the checker head 2 is taken out from the elevating device 1 in the lateral direction. FIG. 2 and FIG. 3 show this state.

The lower check plate mounted on the lower base 21 and the upper base 22 of the checker head 2
The 210 and the upper check plate 220 are switched according to the printed wiring board 8 to be inspected.

At this time, the positioning pins 25 are
Guide the 0 and upper check plate 220 to the correct position.
Therefore, the lower check plate 210 and the upper check plate 2
20 can be easily installed in a short time. That is, the external setup can be performed quickly.

The upper check plate 220 has an upper stripper plate 32 corresponding to the printed wiring board 8 to be inspected.
Attach.

Also, a stripper plate 31 is attached to the frame 10 of the elevating device 1 in accordance with the printed wiring board 8 to be inspected.

Then, as shown in FIG. 2 and FIG. 3, the lower base 21 and the upper base
Are assembled together.

With the checker head 2 set in this way,
As shown in FIG. 1, the checker head 2 is mounted on the elevating device 1 from a lateral direction.

Thereafter, the continuity test of the printed wiring board 8 is performed by moving the lifting device 1 up and down.

Then, as the elevating device 1 moves up and down, the lower base 21 and the upper base 22 move up and down. Furthermore,
The lower check plate 210 and the upper check plate 220 move up and down via the lower base 21 and the upper base 22. At this time, the ball guide post 231 is
Thereby, the inside of the guide cylinder 232 slides smoothly. Thereby, at the time of inspection, the lower check plate 210 and the upper check plate 220 are accurately matched.

In addition, the lower check plate 210 is
In addition, the positioning accuracy of the upper check plate 220 is further improved.

On the other hand, as shown in FIG.
At 51, the printed wiring board 8 to be inspected is sent onto the stripper plate 31. At this time, as shown in FIG. 4, the guide pins arranged on the stripper plate 31 are used.
311 guides the printed wiring board 8 in the transport direction,
This prevents the printed wiring board 8 from swaying.

Then, as shown in FIG. 2 and FIG. 3, the lower check plate 210 and the upper check plate 220
When approaching, the probe needle 41 comes into contact with the printed wiring board 8 on the stripper plate 31.
Specifically, the distal end of the probe needle 41 electrically contacts the entrance of the through hole of the conduction pattern provided on the surface of the printed wiring board 8.

At the time of the above inspection, the printed wiring board 8 is sandwiched between the stripper plate 31 and the upper stripper plate 32, as shown in FIG. Also,
Prior to this, the printed wiring board 8 is positioned by the pilot pins 211 of the lower check plate 210. Also, probe needle 4 of upper check plate 220
1 is inserted through the needle hole 324 of the upper stripper plate 32. Also, the pin holes 321 of the upper stripper plate 32 are provided.
, The guide pin 311 of the stripper plate 31 is inserted.

When the probe needle 41 comes into contact with the printed wiring board 8, the needle body 412 compresses the spring 413 as shown in FIG. Then, electricity is supplied to the needle main body 412 through the lead wire 414 as shown in FIG. Thus, the electrical continuity of the printed wiring board 8 is inspected.

Thereafter, the lower check plate 210 and the upper check plate 220 are moved in a direction away from each other by the lifting / lowering device 1 to separate the probe needle 41 from the printed wiring board 8.

At this time, the lower check plate 210 is lowered while raising the knock pin 26 and supporting the stripper plate 31. As a result, the probe needle 41 and the pilot pin 211 are pulled out of the printed wiring board 8. Further, since the printed wiring board 8 is on the stripper plate 31, the printed wiring board 8 is not twisted due to "warp" or the like. Therefore, the pilot pin 211 and the like can be smoothly removed.

Further, since the stripper plate 32 is elastically supported by the upper check plate 220, when the probe needle 41 is pulled out from the printed wiring board 8, the printed wiring board 8 is prevented from lifting. Also,
Thereby, the probe needle 41 can be pulled out smoothly, and the probe needle 41 can be protected.
After the inspection is completed, the printed wiring board 8 is discharged from the discharging device.
At 52, the printed circuit board 8 to be inspected next is transferred onto the stripper plate 31 by the loading device 51.

In this way, the continuity test of the printed wiring board is sequentially performed. As described above, according to the present embodiment, the check plate can be easily set in a short time because the main part of the inspection is configured as the cassette type checker head.

[Brief description of the drawings]

FIGS. 1 to 5 show an apparatus for checking the electrical properties of a printed wiring board according to an embodiment, FIG.
The figure is a partial cross-sectional front view of the checker head, FIG. 3 is a side view of the checker head, FIG.
The figure is a side view of a probe needle, and FIG. 6 is an overall front view of a conventional printed circuit board electrical check device. 1 ... Elevating device, 2 ... Checker head, 21 ... Lower base, 210 ... Lower check plate, 211 ... Pilot pin, 22 ... Upper base, 220 ... Upper check plate, 231 ... Ball guide post , 232: Guide tube, 242: Sub guide, 25: Positioning pin, 31: Stripper plate, 311: Guide pin, 32: Upper stripper plate, 4: Conductivity tester, 41: Probe needle , 8 ... Printed wiring board,

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01R 31/02 G01R 31/28 H05K 13/08 H05K 3/00

Claims (1)

(57) [Claims] 1. A lifter, a cassette-type checker head which can be detachably mounted in a horizontal direction with respect to the lifter, and a stripper plate disposed at the center of the checker head and fixed to the lifter. An electric check device for a printed circuit board, wherein a probe needle connected to a continuity tester is implanted in the checker head, wherein the checker head comprises a lower base having a lower check plate, and an upper check plate. And a ball guide column for guiding the vertical movement of the lower base and the upper base. The upper check plate and the lower check plate are provided between the lower base and the upper base. The probe needles are implanted so that they can move forward and backward, respectively. The guide has guide pins for positioning the printed circuit board, and when the checker head is mounted on the elevating device, is configured to be located between an upper check plate and a lower check plate. The lower check plate and the upper check plate are moved up and down through the lower base and the upper base by the movement to bring the probe needle into contact with the printed wiring board on the stripper plate. Electric check device.