JPH0464430B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a mounted circuit board (hereinafter simply referred to as a circuit board) as an object to be inspected, which is assembled by mounting various electronic components on a flat circuit board. The present invention relates to a circuit board testing device that ultimately conducts a continuity test, and particularly relates to a double-sided circuit board testing device that tests a test object having various electronic components mounted on both sides of a circuit board.

[Technical background of the invention and its problems]

This type of circuit board testing equipment, which has already been proposed, uses a large number of contact pins (also called contact probes) to test the circuit board for continuity, with various electronic components inserted on only one side of the circuit board. There is.

That is, the circuit board inspection device described above elastically plants a large number of contact pins on a pin board,
Each of these contact pins is brought up and down from above or below and pressed into contact with the conductor portion of the other side of the circuit board protruding from each electronic component mounted on one side of the circuit board, thereby performing an electrical continuity test. It's summery.

In this way, the circuit board as the object to be inspected has protrusions made of various electronic components on only one side, and the other side of the circuit board forms the inspection circuit surface, so the contact pins are not placed under inspection. Measurement and inspection are performed by contacting and conducting the circuit board from the other side of the body.

However, in order to miniaturize the various electronic components used in recent circuit boards, they are forced to be arranged in high-density arrangements. Continuity testing of these double-sided circuit boards is used because
Simultaneously from the top and bottom of a double-sided circuit board, and
It is desired to perform continuity testing in one step at once.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and it is possible to remove various electronic components mounted on both sides of a circuit board from the top and bottom of the board in one process.
Furthermore, the present invention provides a circuit board testing device that aims to improve the efficiency and reliability of testing work by performing continuity testing reliably.

[Summary of the invention]

In the present invention, a plurality of guide columns are installed on a support base, a fixed plate having an upper pin board having downward contact pins is supported on the upper part of each guide column, and each of the above-mentioned guide columns below the fixed plate. A movable plate having a lower pin board having upward contact pins is movably supported upwardly, and above the lower pin board and below the upper pin board, the movable plate is slidable up and down on each of the guide columns. A holding member is movably fitted, an upper compression spring is interposed between the fixed plate and the holding member, a lower compression spring is interposed between the movable plate and the holding member, the holding member is placed in a floating state, and the upper The compression spring is made weaker than the lower compression spring, and the holding member holds a circuit board having parts to be inspected on both the upper and lower sides, and as the lower pin board rises, the double-sided circuit on the holding member is placed between it and the upper pin board. The structure is such that a double-sided circuit board can be reliably tested for continuity in one process by sandwiching the board between them.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

In FIG. 1, reference numeral 1 denotes a flat support base, and a lower connector 2 is provided on one side of the support base 1 so as to be connected to an inspection display 3 via a lead wire. A power switch 4 having a pilot lamp is attached to the other side of the support base 1. Further, a plurality of (four in the figure) guide columns 5 are installed at each corner of the support base 1, and the guide columns 5 have a large number of downward contact pins on the upper part. A fixed plate 6 supporting the upper pinboard 6a is fixed horizontally. Furthermore, an upper connector 7 that is connected to the inspection display 3 via a lead wire is fixed to the fixed plate 6, and the current from the upper connector 7 and the lower connector 2 is transmitted to the inspection display 3. It is designed to flow to the screen and display the continuity test.

On the other hand, as shown in FIG. 2, below the fixed plate 6, a movable plate 8 that supports a lower pin board 8a is fitted into each of the guide columns 5 so as to be slidable upward and downward. A large number of contact pins 9 are provided on the upper surface of the lower pin board 8a so as to move up and down in an upward and elastic manner. Note that the lower end of each contact pin 9 is
It is connected to the lower connector 2 through each conductive wire.

Further, between the upper pin board 6a and the lower pin board 8a, a flat holding member 10 having a large opening in the center is fitted into each of the guide columns 5 so as to be slidable upwardly and downwardly. The holding member 10 is held in a floating state by compression coil springs 14 and 15 interposed between it and the movable plate 8 and between it and the fixed plate 6, respectively. That is, as shown in FIG. 2, a pair of guide pins 11 are erected upwardly on a lower plate 8b forming a part of the movable plate 8.
A pair of guide pins 12 are implanted in the holding member 10 located directly above each of the guide pins 11 so as to penetrate the guide pins 12 vertically. Furthermore, a pair of guide pins 13 are vertically provided in a portion of the fixing plate 6 located directly above each guide pin 12 . And each guide pin 11 and each guide pin 12
Each coil spring 14 is interposed between the holding member 10 and the movable plate 8, and
is elastically interposed, and each guide pin 1
2 and the guide pin 13, so as to be interposed between the holding member 10 and the fixing plate 6.
Each coil spring 15 is elastically interposed, and in particular, the upper coil spring 15 is connected to the lower coil spring 1.
The elasticity is weaker than that of 4.

On the other hand, as shown in FIGS. 1 and 3, on both sides of the holding member 10 close to the guide columns 5, brackets 16 each having a partially cylindrical bearing sleeve 16a are arranged in parallel. Each bearing 16a is provided with a horizontally slidable guide shaft 19 which is integral with an extraction plate 18 having a handle 17. The extraction plate 18 constitutes a support plate for the circuit board W as the object to be inspected. Further, a pair of guide pins 20 are arranged diagonally on the upper surface of the extraction plate 18, which has a substantially rectangular shape.
It is implanted in such a way that it is removably fitted and its position is regulated.

As described above, various electronic components are attached to both sides of the circuit board W by adhesion using a conductive adhesive, etc., and the lower surface of the circuit board W is attached to the support plate 10. It is designed so that it can resiliently abut against each of the contact pins 9 rising through the opening (see FIG. 3).

On the other hand, the extraction plate 1 on which the object W to be inspected is mounted
The above-mentioned upper pin board 6a is vertically installed on the fixed plate 6 directly above the upper pin board 6.
There are many downward contact pins 2 on the bottom surface of a.
1 is used as a unit 22, and is detachably attached, and each contact pin 21 is
It is adapted to resiliently come into contact with the inspection portion on the upper surface of the object to be inspected w. Also, the above upper pin board 6
A plurality of pressing pins 23 are provided on the lower surface of a so as to be able to press the upper surface of the object W to be inspected, and each of the pressing pins 23 prevents the object W to be inspected from floating and is used for positioning. It's becoming useful.
Further, the upper ends of the plurality of contact pins 21 are connected to the upper connector 7 through conductive wires, and the upper connector 7 is connected to the inspection display 3 through lead wires as described above. There is.

Furthermore, as shown in FIG. 2, stoppers 24 and 25 are attached to both ends of both guide shafts 19, and these stoppers 24 and 25 are
The position of the extraction plate 18 when extracted and inserted can be controlled by the handle 17.

As shown in FIGS. 1 and 4, a pair of bearings 26 are vertically fixed on both sides of the front of the extraction plate 18, and bearing holes are provided in the top surfaces of both bearings 26. Each engagement hole 26a is vertically bored adjacent to the engagement hole 26a. Further, a support shaft 27a of a lock handle 27 that constitutes a locking device for the extractor plate 18 is fitted into both bearings 26 so as to be slidable so as not to come off. Each of the engaging pins 28 hanging down at a position offset from 27a is adapted to engage with each of the locking holes 26a. The support shaft 27a constitutes a locking member. Further, inside the shaft 10b fixed in the tube shaft 10a of the holding member 10 located directly below the support shaft 27a of each of the lock handles 27, there are operating switches S ₁ , S ₂ preferably constituted by proximity switches. is provided. Therefore, when the two lock handles 27 rotate around the two bearings 26 after inserting the extraction plate 18 and engage the respective engagement pins 28 in the respective engagement holes 26a, each of the above-mentioned supports is rotated. The shaft 27a descends until the engagement pin 28 is recessed into the engagement hole 26a, and its lower end is connected to both tube shafts 10a.
This temporarily fixes and locks the movement of the extraction plate 18, and the support shaft 27a is connected to the proximity switch.
By being close to S ₁ and S ₂ , each switch S ₁ and S ₂
The circuit is turned on and the circuit is energized to start the continuity test as described below. The actuating switches S ₁ and S ₂ thus constitute a lock detection device.

On the other hand, in FIGS. 1 and 2, a motor 29 with a brake is installed on the rear upper surface of the support substrate 1, and an output shaft 29a of this motor 29
A first cam member 30 having an inverted heart shape and a second cam member 31 having a protrusion 31a are mounted on the shaft. Further, each bracket 32 is attached to a position on the support substrate 1 close to the rotation area of the first cam member 30, and each operating lever 33 is attached to each bracket 32 by each supporting shaft 34. It is equipped with a shaft. Further, one end 33a of each operating lever 33 is in contact with the periphery of the first cam member 30, and the other end 33b of each operating lever 33 is in contact with the periphery of the first cam member 30.
are resiliently abutted against respective abutting members 8c attached to the bottom surface of the lower plate 8b of the movable plate 8 due to the elasticity of the respective coil springs 14 and 15 that tend to expand. Furthermore, the protrusion 3 of the second cam member 31
An upper limit switch _S3 and a lower limit switch _S4 are provided on the movement trajectory of 1a.
As described later, the lower limit switch _S3 is activated when the lower pin board 8a and the movable plate 8 rise to the upper limit position, and the lower limit switch _S4 is activated when the lower pin board 8a and the movable plate 8 rise to the upper limit position as described later. It is designed to operate when the lower limit position is reached.

These switches S ₃ and S ₄ are similar to the above-mentioned switches S ₁ and
It is incorporated together with S ₂ into an electric circuit as shown in FIG. In the same figure, R ₁ , R ₂ , R ₃ , R ₄ are relays,
r ₁ , r ₂ , r ₃ , r ₄ are the contacts of these relays, T ₁ is the timer that operates at the start of operation, T ₂ is the timer that regulates the inspection time, t ₁ , t ₂ are the contacts of timers T ₁ , T ₂ Contact point, C is a capacitor, B is a brake of the motor 29, and PL is a power pilot lamp.

The operation of the circuit board inspection apparatus described above will be explained below.

In order to insert the double-sided circuit board W as an object to be inspected into the extraction plate 18 for inspection, each of the above-mentioned locking handles is first pulled up and rotated slightly outward. Pull out each engaging pin 28 from the matching hole 26a. As a result, the support shafts 27a of both lock handles 27 are attached to the holding member 10.
When the tube is pulled out from the tube shaft 10a, both operating switches S ₁ and S ₂ are turned OFF.

Next, by manually pulling out the handle 17 of the extractor plate 18 forward, both guide shafts 19 integrated with the extractor plate 18 can be attached to the bearings 16a of each bracket 16.
It slides forward as it is guided by.

As shown in FIG. 3, a double-sided circuit board W is inserted into each guide pin 20 of the extraction plate 18 that has been pulled forward in this manner. Then again,
By inserting the extraction plate 18 into its original position and rotating both the lock handles 27 inwardly, each engagement pin 28 of both lock handles 27 engages with each engagement hole 26a. Then, the support shaft 27a engages within the tube shaft 10a, and the extraction plate 18 is locked onto the holding member 10. On the other hand, as the lower end of each support shaft 27a approaches the operating switches S ₁ and S ₂ , the operating switches S ₁ and S ₂ as proximity switches are turned on. In this case, since the support shaft 27a does not come into direct contact with the switches S ₁ and S ₂ ,
No impact force is applied to it, and the operating switch
Failure of S ₁ and S ₂ is unlikely to occur.

By operating the lock handles 27 on both sides, only when the support shafts 27a on both sides as locking members have completely locked the extraction plate 18, both operating switches S ₁ and S ₂ are closed, and the fifth switch is closed. The timer shown in the diagram
The circuit of T ₁ is closed. The timer T ₁ closes the timer contact t ₁ when a set time of one to several seconds has elapsed after the extraction plate 18 was locked. As a result, relay _R1 is energized via normally closed relay contacts _r2 and _r4 , relay contact _r1 is closed, and motor 29 is driven, and the first cam member 30 fixed to its output shaft 29a and Second
Since the cam members 31 both rotate clockwise in FIG. 2, the first cam member 30 causes the actuating lever 33 to pivot clockwise in FIG. 2 about the support shaft 34. As a result, one end 33a of the operating lever 33 is pushed downward, and the other end 33b pushes the movable plate 8 upward via the abutting member 8c.

As the movable plate 8 rises due to this pushing up, the lower coil spring 14 applies a pushing force to the holding member 10.
The holding member 10 is also raised. The pushing up force is further transmitted from the holding member 10 to the upper coil spring 15. By the way, the upper end of the upper coil spring 15 is in contact with the fixed plate 6, and since the upper coil spring 15 is weaker than the lower coil spring 14, when the movable plate 8 starts to rise, the upper coil spring 15 first moves upward. begins to be compressed. At this time, the lower coil spring 14 is hardly compressed, and therefore the relative distance between the upward contact pin 9 of the lower pin board 8a on the movable plate 8 and the circuit board W on the holding member 10 changes. There are almost no On the other hand, due to the compression of the upper coil spring 15, the distance between the circuit board W on the holding member 10 and the downward contact pins 21 of the upper pin board 6a gradually decreases, and finally the inspection point on the upper surface of the circuit board W points downward. In contact with the contact pin 21. Then, the lower ends of the press pins 23 come into contact with the upper surface of the circuit board W to prevent it from floating, and are pressed and positioned. Press pin 23
The position of is determined at a position where such an effect is optimally performed.

After reaching this state, upper coil spring 1
5 compression stops. In addition, the upper coil spring 15 has a weak elasticity, and when the downward contact pin 21 first comes into contact with the electronic component on the upper surface of the circuit board W, it exerts a soft buffering effect and protects the component. The electronic components on the top surface of the circuit board W are often flat packages as shown by P in FIG. 3, and the many bent conductive arms _P1 protruding around them are extremely weak.
For example, it deforms with a force exceeding 30 grams. The soft buffering action of the upper coil spring 15 makes it possible to bring the contact pin 21 into contact with the weak conductive arm of the flat package with a predetermined weak force, thereby preventing accidents such as peeling of the conductive adhesive surface and applying accurate pressing force. secure.

In this way, the downward contact pin 21 is brought into contact with the upper surface component of the circuit board with a predetermined force and a buffering effect, and after ensuring a predetermined conductive relationship without undue stress, the lower coil spring 14 is compressively deformed. As the movable plate 8 continues to rise while causing a It can be read by

In this way, when the movable plate 8 reaches the upper limit position, the upper limit switch S ₃ switches the projection 31a of the second cam 31.
Pressed to close. Then, relay R ₂ is activated via normally closed contact t ₂ , and normally closed contact r ₂ opens, so that power to relay R ₁ is stopped. As a result, the relay contact _r1 opens and the motor 29 stops, and at the same time, the relay contact _r1 of the brake B circuit also opens, and the brake is applied to the motor 29, causing the motor 29 to stop.

On the other hand, the activation of relay R ₂ causes the normally open relay contact r ₂
is closed and relay R ₃ is activated, relay contact R ₃ is closed, so the timer contact T ₁ is closed and the timer is activated.
T ₂ is activated. As described above, this timer _T2 is a timer for regulating the measurement and inspection time, and the normally closed contact _t2 opens when the measurement and inspection time of several seconds to several tens of seconds has elapsed. This deactivates relay R ₂ , closes normally closed relay contact r ₂ again and activates relay R ₁ ,
Relay contact _r1 closes and motor 29 again begins to rotate clockwise in FIG.

Therefore, the first cam member 30 allows the operating lever 33 to rotate counterclockwise in FIG. 2 due to the weight of the lower pin board 8a, the movable plate 8, the holding member 10, etc. When the pin board 8a, the movable plate 8, etc. are lowered to the lower limit position, the protrusion 31a of the second cam member 31 closes the lower limit switch _S4 .
As a result, relay R ₄ is activated, its relay contact r ₄ is opened, and relay R ₁ is deactivated, relay contact r ₁ is opened, motor 29 is stopped, and brake B
It takes.

As described above, only when the extractor plate 18 is completely locked by pushing the support shaft 27a through the operation of the lock handle 27, the double operation switches S ₁ and S ₂ are activated.
is closed, and only then can the operation for the measuring test begin, which begins with the raising of the movable plate 8; if the locking is incomplete, no measuring test can be carried out.

Next, by pulling up both lock handles 27 and rotating them outward, the holding member 10
After pulling out the support shaft 27a from the tube shaft 10a and thereby releasing the lock of the extraction plate 18, the double-sided circuit board W is removed by holding the handle 17 with your hand and pulling out the extraction plate 18 forward. It can be taken out.

In this way, the continuity test of the double-sided circuit board W is repeatedly and continuously performed.

〔Effect of the invention〕

As described above, according to the present invention, by simply moving the movable plate toward the fixed plate, the continuity test on both sides of the double-sided circuit board as the object to be inspected can be carried out in one process and reliably. In addition to being easy to handle, the holding member that supports the double-sided circuit board is supported in a floating state via upper and lower compression springs, and one compression spring is made weaker than the other. The contact pin and circuit board are first brought into contact with the weaker compression spring side with a buffering effect, and then the contact pin and the circuit board are brought into contact with the stronger spring side, so the upper pin board and the lower pin Inspections can be carried out over a long period of time without bending or damaging the minute contact pins of the board, and without damaging the electronic components of the circuit board.

[Brief explanation of the drawing]

FIG. 1 is a front view of a circuit board inspection apparatus according to the present invention, FIG. 2 is a side view of the same, FIG. 3 is an enlarged sectional view showing main parts of the present invention, and FIG.
FIG. 5, an enlarged vertical cross-sectional view of chain circle A in the figure, is a diagram showing an electric circuit incorporated in the present invention. DESCRIPTION OF SYMBOLS 1... Support board, 3... Inspection display, 5... Guide column, 6... Fixed plate, 6a... Upper pin board, 8... Movable plate, 8a... Lower pin board, 9
...Contact pin, 10...Holding member, 14...
...Lower compression spring, 15...Upper compression spring, 16...
...Bracket, 18...Extraction plate, 21...Contact pin, 27...Lock handle, 27a...
Lock handle support shaft, 28...Engagement pin, 29...
...Motor, 30...First cam member, 31...Second
Cam member, 33... Operating lever, W... Double-sided circuit board.

Claims (1)

[Scope of Claims] 1. A plurality of guide columns are installed on a support base, and a fixed plate having an upper pin board having downward contact pins is supported on the upper part of each guide column, and a lower part of the fixed plate is supported. A movable plate having a lower pin board having upwardly facing contact pins is supported on each of the guide columns so as to be movable upwardly, and above the lower pin board and below the upper pin board, each of the guide posts A holding member is fitted onto the column so that it can slide up and down, and an upper compression spring is interposed between the fixed plate and the holding member, and a lower compression spring is interposed between the movable plate and the holding member to float the holding member. 1. A circuit characterized in that the force of the upper compression spring is made weaker than the force of the lower compression spring, and the holding member is provided with means for detachably holding a circuit board having a portion to be inspected on both upper and lower surfaces. Board inspection equipment. 2. Both the upper compression spring and the lower compression spring are coil springs, and the upper compression spring is fitted between a guide pin that projects downward from the fixed plate and a guide pin that projects upward from the holding member, and the guide projects upward from the movable plate. 2. The circuit board inspection device according to claim 1, wherein a lower compression spring is fitted between the pin and a guide pin projecting downward from the holding member.