WO2015022875A1 - Printed circuit board inspection device - Google Patents

Abstract

Provided is an inspection device for inspecting the quality of the conduction and insulation of a printed circuit board, wherein there is no need to take the warping and twisting of the printed circuit board into consideration and both sides of the printed circuit board can be inspected simultaneously. An inspection device (1) according to the present invention inspects a printed circuit board (2) placed on a plate-like tray (3) in a state in which the printed circuit board (2) is held between an upper inspection jig (4) and a lower inspection jig (5). At the time of the inspection, a lifting and lowering unit (6) is used to lower the upper inspection jig (4), and the printed circuit board (2) placed on the plate-like tray (3) is sandwiched between the upper inspection jig (4) and lower inspection jig (5). In this state, an inspection pin provided in the upper inspection jig (4) is made to come into contact with wiring formed on the upper surface of the printed circuit board (2), and the conduction or insulation between the inspection pin and the wiring is inspected.

Description

Printed circuit board inspection equipment

The present invention relates to a printed circuit board inspection apparatus for inspecting a continuity failure and insulation failure of a printed circuit board.

Generally, a pin contact method and a non-contact method are known as methods for inspecting a continuity failure and insulation failure of a printed circuit board. Among these, in the pin contact type inspection apparatus, each end of the plurality of inspection pins is electrically connected via a connector to a control unit that determines the electrical continuity state of the inspection target substrate. And the quality of conduction | electrical_connection and insulation is determined by applying a voltage between test | inspection pins in the state which made the front-end | tip of a test | inspection pin contact the wiring provided in the test object board | substrate, and measuring resistance value.

In the above-described pin contact type inspection apparatus, when the inspection target is a flexible printed circuit board, various measures are taken so that inspection defects do not occur due to warping or twisting of the printed circuit board.

In the inspection apparatus described in the background art section of Patent Document 1, a printed circuit board for inspection is placed on a plate to which a vacuum pad is attached, and inspection is performed in a state where the flexible printed circuit board is vacuum-adsorbed and fixed to the plate. ing. If the inspection is performed in such a state, the printed circuit board is not deformed even if the inspection pin touches the pad, so that an accurate inspection can be performed.

On the other hand, in the inspection apparatus described in the column of the embodiment of Patent Document 1, the edge of the flexible printed circuit board is pulled in a state clamped by a clamper, and the printed circuit board forms a flat surface. The tip is in contact with the pad on the printed circuit board.

According to this inspection device, inspection can be performed without adhering and fixing the printed circuit board with a vacuum pad. Furthermore, since both sides of the inspection can be performed simultaneously, the time required for the inspection can be shortened.

On the other hand, when manufacturing a flexible printed circuit board, a plurality of wiring patterns having the same shape are formed on one sheet-shaped printed circuit board, and after the inspection is completed, the sheet-shaped printed circuit board is often cut and separated into individual printed circuit boards. . Such a printed circuit board is inspected in the form of a sheet.

When inspecting a printed circuit board, it is necessary to create a dedicated jig in which inspection pins are arranged at positions corresponding to the inspection locations of the printed circuit board. Since this jig becomes more expensive as the number of inspection pins increases, an inspection jig having a number of inspection pins corresponding to the individual printed circuit board is prepared for the above-described sheet-like printed board, and the position of the sheet is shifted. However, individual printed circuit boards are inspected.

Special table 2007-529008 gazette

In an inspection apparatus of a type that inspects a printed circuit board while adsorbed as described in the background art section of Patent Document 1, it is necessary to perform inspection on each side of the printed circuit board. Further, since it is necessary to move the plate in accordance with the movement of the printed circuit board or to release the suction every time the movement is performed and to suck the printed circuit board again after the movement, the structure of the inspection apparatus becomes complicated and larger.

Furthermore, in the inspection apparatus that inspects the printed circuit board while adsorbing the printed circuit board, it is necessary to inspect the printed circuit board on both sides of each side and turn the sheet upside down after completing the inspection on one side. Takes time.

On the other hand, in an apparatus that inspects the edge of a flexible printed circuit board as clamped by a clamper, as described in the embodiment of Patent Document 1, both sides can be inspected simultaneously. Until the process is completed, it is necessary to continue to pull the printed circuit board so that warping and twisting do not occur, and a clamper that can accurately control the tension is required, which makes the inspection apparatus expensive.

The present invention has been made in view of the above-described problems, and an object thereof is to provide an inspection apparatus that does not need to suck or pull the printed circuit board and can simultaneously inspect both surfaces of the printed circuit board.

In order to achieve the above object, a printed circuit board inspection apparatus according to the present invention brings an inspection pin into contact with a predetermined portion of a wiring of a printed circuit board having wiring formed on at least one surface, and two selected A printed circuit board inspection apparatus that inspects the continuity or insulation of the printed circuit board by applying a voltage between the inspection pins through the wiring,
A plate-like tray formed of an insulating material on which the printed circuit board is placed;
An upper inspection jig for inspecting wiring on the upper surface of the printed circuit board and a lower inspection jig for inspecting wiring on the lower surface;
The upper inspection jig placed above the lower inspection jig is lowered, and the printed circuit board placed on the tray is sandwiched between the upper inspection jig and the lower inspection jig, thereby An elevating unit for contacting the inspection pin of the inspection jig and the wiring of the printed circuit board;
An inspection unit that applies a voltage between two selected inspection pins of the upper inspection jig and measures a resistance value between them;
And a control unit for controlling the operation of the lifting unit.

Here, the inspection pin of the lower inspection jig contacts the wiring on the lower surface of the printed circuit board through the opening formed in the tray, and the inspection unit selects the upper inspection jig and the lower inspection jig. It is preferable to apply a voltage between the two inspection pins and measure a resistance value between them.

Further, it is preferable that a first guide pin inserted into a positioning hole formed in the printed board is attached to the upper surface of the tray. Similarly, it is preferable that a second guide pin that is inserted into a positioning hole formed in each of the printed circuit board and the tray is attached to the upper surface of the lower inspection jig.

A printed circuit board inspection apparatus according to the present invention includes a pair of substrate transport units that transport a printed circuit board placed on the tray in a horizontal direction, and the substrate transport unit has an end of the tray placed thereon. And a tray base having a third guide pin inserted into a positioning hole formed in the tray attached to the upper surface, and a chuck for gripping the tray with the tray base. .

Here, the substrate transport unit is configured so that the tray table can move in the vertical direction, and after the inspection is finished, the tray placed on the tray table is raised, and the lower inspection jig The second guide pin is preferably removed from the positioning hole of the printed board. Similarly, the substrate transport unit raises the tray base to a position where it does not contact the lower inspection jig when transporting a tray placed on the tray base, and when performing inspection, It is preferable that the tray table is lowered to a position where the tray is placed on the lower inspection jig.

Further, it is preferable that the substrate transport unit releases the grip of the tray by the chuck when the tray is placed on the lower inspection jig.

In the printed circuit board inspection apparatus according to the present invention, the substrate reversing unit for reversing the direction of the printed circuit board placed on the tray between the pair of slide tables installed along the movement path of the pair of substrate transport units. And the substrate reversing unit is composed of a table for placing the tray, a rotating means for rotating the table, and a first elevating means for moving the table in the vertical direction. preferable.

Further, in the printed circuit board inspection apparatus according to the present invention, between the plurality of wiring patterns formed on the printed circuit board between the pair of slide tables installed along the movement path of the pair of circuit board transport units, It is preferable that an identification mark applying means for applying an identification mark to the wiring pattern determined to have poor insulation is installed.

Here, the identification mark applying means is composed of a punching unit, and the punching unit collides with each other so as to sandwich the printed circuit board and opens a hole in the printed circuit board, and the upper puncher and the lower puncher. A slider for moving the puncher in a direction perpendicular to the transfer direction by the substrate transfer unit; and second and third lifting means for moving each of the upper puncher and the lower puncher in the vertical direction. Is preferred.

If the inspection apparatus of the present invention is used, the printed circuit board is transported and inspected in a state where it is placed on the tray, and it is not necessary to consider warping or twisting of the printed circuit board. As a result, the device can be manufactured at low cost. Moreover, since both sides of the printed circuit board can be inspected simultaneously, the time required for the inspection can be shortened.

FIG. 1 is a front view of main components of the printed circuit board inspection apparatus according to the first embodiment of the present invention. FIG. 2 is a plan view of the printed circuit board inspection apparatus according to the first embodiment, as viewed from the line XX in FIG. FIG. 3 is a block diagram of an electrical system configuration of the printed circuit board inspection apparatus according to the first embodiment. FIG. 4 is a plan view showing an example of a tray and a printed circuit board placed on the tray. FIG. 5 is a diagram showing a state in which a part of the printed circuit board 2 placed on the tray is looked up from below. FIG. 6 is a cross-sectional view of a main part of the upper inspection jig according to the first embodiment. FIG. 7 is a front view of the substrate transfer unit according to the first embodiment. FIG. 8 is a plan view of the substrate transfer unit. FIG. 9 is a side view of the substrate transport unit. FIG. 10 is a flowchart for explaining the operation of the printed circuit board inspection apparatus. FIG. 11 is a main part front view for explaining the operation of the upper inspection jig and the lower inspection jig. FIG. 12 is a plan view illustrating the configuration of the substrate reversing unit and the punching unit of the printed circuit board inspection apparatus according to the second embodiment.

Hereinafter, a printed circuit board inspection apparatus according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
<Configuration of printed circuit board inspection device>
FIG. 1 is a diagram of main components of a printed circuit board inspection apparatus (hereinafter simply referred to as “inspection apparatus”) according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line XX in FIG. FIG. 3 is a block diagram showing the configuration of the electrical system of the inspection apparatus. In FIG. 2, the support column 601 is omitted, and only the outline of the tray 3 is indicated by a two-dot chain line in consideration of easy viewing.

The inspection apparatus 1 according to the present embodiment is mainly used for inspection of a flexible printed circuit board (hereinafter simply referred to as “printed circuit board”) in which wiring is formed on both front and back surfaces, and performs inspection of wiring on the upper surface of the printed circuit board 2. The upper inspection jig 4 to be performed, the lower inspection jig 5 for inspecting the wiring on the lower surface, the elevating unit 6 for moving the upper inspection jig 4 in the vertical direction, and the tray 3 on which the printed board 2 is placed in the horizontal direction. It is comprised of a pair of substrate transfer units 7 that are transferred to each other.

Before describing the configuration of each part of the inspection apparatus 1, the features of the inspection apparatus according to the present invention will be described.

The first characteristic point of the inspection apparatus according to the present invention is that the inspection is performed in a state where the above-described flexible printed circuit board 2 is placed on the flat tray 3. As explained in the background art section, in the conventional inspection device for flexible printed circuit boards, the printed circuit board is vacuum-adsorbed and fixed to the plate so that inspection defects due to warping or twisting of the printed circuit board do not occur. Or inspected with the edge of the substrate pulled by a clamper.

On the other hand, in the inspection apparatus of the present invention, inspection is performed in a state where the printed circuit board 2 placed on the flat tray 3 is sandwiched between the upper inspection jig 4 and the lower inspection jig 5. If the inspection of the flexible printed circuit board 2 is performed in a state where it is placed on the tray 3, no warping or twisting occurs on the printed circuit board, so there is no need to suck the printed circuit board or pull it with a clamper. Furthermore, since a simple configuration in which the printed circuit board 2 placed on the tray 3 is sandwiched between the upper inspection jig 4 and the lower inspection jig 5 can be employed, the cost of the inspection apparatus can be significantly reduced.

FIG. 4 (a) shows an example of the tray 3, and FIG. 4 (b) shows an example of the printed circuit board 2 placed on the tray 3. FIG. The flat tray 3 made of an insulating synthetic resin is formed with four guide pins 301, a plurality of positioning holes 302 and 303, and a plurality of openings 304. On the other hand, wiring 201 and a plurality of positioning holes 202 are formed in the printed circuit board 2.

The guide pins 301 also serve to prevent the printed circuit board 2 from falling off. By inserting the guide pins 301 into the four holes 202 provided at opposite positions of the printed circuit board 2, the printed circuit board 2 is firmly attached to the tray 3. Fixed. Therefore, when the tray 3 is transported using the substrate transport unit 7, the printed circuit board 2 is not dropped from the tray 3 or shifted in position.

The four holes 302 formed at the left and right ends of the tray 3 are used when the tray 3 is transported using the substrate transport unit 7, and guide pins 713 ( If the tray 3 is transported in a state in which it is inserted, the tray 3 will not fall out of the substrate transport unit 7.

The other holes 303 formed in the tray 3 and the holes 202 formed at positions facing the printed circuit board 2 are positioning holes for the inspection jig, and are provided in the lower inspection jig 5 in these holes. By inserting the guide pins 504, the printed circuit board 2 is accurately positioned with respect to the lower inspection jig 5.

The plurality of openings 304 provided in the tray 3 are used for bringing the inspection pins of the lower inspection jig 5 into contact with the inspection target portions (for example, pads) of the wiring 201 formed on the lower surface of the printed board 2 at the time of inspection. Is. By providing the opening 304 in the tray 3, the inspection can be performed without any trouble even when the printed circuit board 2 is placed on the tray 3.

In the inspection, the upper inspection jig 4 is lowered using the lifting unit 6, and the printed circuit board 2 placed on the flat tray 3 is sandwiched between the upper inspection jig 4 and the lower inspection jig 5. In this state, the inspection pins provided on each inspection jig are brought into contact with the pads of the printed circuit board 2 to inspect for wiring continuity and insulation defects.

The position and size of the opening 304 formed in the tray 3 will be described with reference to FIG. FIG. 5 shows a state in which a part of the printed circuit board 2 placed on the tray 3 is looked up from below. In the figure, the satin-like portion indicates the printed circuit board 2, and the two-dot chain line indicates the opening 304. 5A and FIG. 5B, the size and number of the opening portions 304 formed in the tray 3 are different.

The size of the opening 304 is kept to the minimum necessary, and in particular, in the place where the slit is formed in the printed circuit board 2, consideration is given to the position and size of the opening so that the printed circuit board 2 is not warped or twisted. There is a need to.

The printed circuit board 2 shown in FIGS. 5A and 5B includes three branch portions 2a, 2b, and 2c, and slits are formed around the branch portions. Further, a pad 203 which is a part of the wiring 201 is formed at each branch portion. In the inspection, the printed circuit board 2 is sandwiched between the upper inspection jig 4 and the lower inspection jig 5, and the inspection pins of the lower inspection jig 5 are in contact with the pads 203 through the openings 304. Apply voltage to

As shown in FIG. 5A, when the opening 304 having a size that includes all the pads 203 of the three branches 2a, 2b, and 2c is provided, the ends of the branches 2a, 2b, and 2c are self-weighted. May cause warping or twisting, and the inspection pin may not contact the target pad 203 in some cases. On the other hand, as shown in FIG. 5B, if openings 304 having a relatively small area are formed at positions facing the pads of the three branches 2a, 2b and 2c, the branches 2a, 2b and 2c are hardly bent, and the risk that the inspection pin does not contact the pad 203 due to warping or twisting can be avoided.

As described above, the printed circuit board 2 is inspected while being sandwiched between the upper inspection jig 4 and the lower inspection jig 5 and accurately positioned by the guide pins 504 and the positioning holes 202. High inspection is possible. The inspection process will be described in detail later with reference to FIGS.

Note that the positions and sizes of the guide pins 301, the holes 302 and 303, and the openings 304 of the tray 3 vary depending on the shape of the wiring pattern formed on the printed circuit board 2 and the repeated pitch. Therefore, it is necessary to prepare a tray having a shape corresponding to the target printed circuit board.

The second feature of the inspection apparatus according to the present invention is that the inspection of the printed circuit board 2 on which a plurality of wiring patterns having the same shape are formed is performed a plurality of times by dividing the target area. As described above, when a printed circuit board is manufactured, a plurality of wiring patterns having the same shape are formed on a single sheet-like printed circuit board 2 having a large area, and after the inspection is completed, they are cut into individual patterns. Separated into printed circuit boards. The inspection apparatus of the present invention inspects the sheet-like printed circuit board 2 before being cut.

In the example shown in FIG. 4B, a total of 10 wiring patterns are regularly arranged on the printed circuit board 2 in five rows each having a pair of wiring patterns of the same shape. If these ten wiring patterns are to be inspected simultaneously, a huge number of inspection pins are required for the inspection jig, which makes the inspection jig expensive. In addition, the proportion of poor contact with the substrate increases. In order to avoid this, in the inspection apparatus of the present invention, inspection is performed using an inspection jig provided with a number of inspection pins corresponding to a pair of left and right wiring patterns.

When inspecting using such an inspection jig, in order to inspect all the wiring patterns formed on the printed circuit board 2, it is necessary to move the tray 3 on which the printed circuit board 2 is placed in the horizontal direction. There is. The pair of substrate transfer units 7 and 7 are used for that purpose.

Each time the pair of left and right wiring patterns is inspected, the tray 3 is transported in the horizontal direction (direction indicated by arrow A in FIG. 2) by the pair of substrate transport units 7 and 7 disposed on the left and right of the lower inspection jig 5. Is done. The substrate transport unit 7 has a function of transporting the tray 3 placed on the tray base 712 in the horizontal direction with the end of the tray 3 sandwiched between the chucks 725, and a function of placing the tray 3 on the lower inspection jig 5. It has. The substrate transport unit 7 will be described in detail later with reference to the drawings.

The inspection apparatus according to the present invention is optimal as an inspection apparatus for a flexible printed board having wirings formed on both sides, but is not limited to the inspection of a flexible printed board having wirings formed on both sides. . Even in the inspection of a flexible printed circuit board or a hard printed circuit board in which wiring is formed only on one surface, the inspection of the printed circuit board can be performed automatically and in a short time by taking advantage of the two feature points described above.

When the inspection apparatus according to the present invention is used for inspection of a flexible printed circuit board in which wiring is formed only on one surface, the same shape and structure as the lower inspection jig 5 instead of the lower inspection jig 5 A dummy jig having an inspection pin but no inspection pin is prepared, and a tray is placed thereon for inspection.

Next, the configuration of the electrical system of the inspection apparatus 1 will be described with reference to FIG. The inspection apparatus 1 applies a voltage between the control unit 8 that controls the operation of the elevating unit 6 and the substrate transport unit 7 and the inspection pins of the upper inspection jig 4 and the lower inspection jig 5, and the resistance therebetween. And an inspection unit 9 for measuring values. Although not shown, the control unit 8 and the inspection unit 9 are accommodated in a casing of an inspection apparatus that is separately installed.

The control unit 8 is composed of a programmable logic controller, and controls the operations of the elevating unit 6 and the substrate transport unit 7 based on data input from the input display unit 801 and stored in the storage unit 802.

More specifically, the lifting unit 6 moves the upper inspection jig 4 in the vertical direction by driving the air cylinder. On the other hand, the board transport unit 7 drives the motor and the air cylinder to transport the tray 3 on which the printed circuit board 2 is placed in the horizontal direction or move it in the vertical direction.

The input display unit 801 of the control unit 8 is composed of a touch panel type liquid crystal device, and inputs data necessary for operating the elevating unit 6 and the substrate transport unit 7 and displays the data. The storage unit 802 includes a flash memory or the like and stores data input from the input display unit 801.

On the other hand, the inspection unit 9 is composed of a personal computer, and includes an input display unit 901, a measurement unit 902, a storage unit 903, and a control unit 904. Among these, the function of the control unit 904 is realized by executing a program read from the storage unit 903 by a CPU (Central processing Unit, not shown).

The input display unit 901 of the inspection unit 9 is composed of a touch panel type liquid crystal device, and is used for inputting data necessary for determining the quality of continuity and insulation, and for displaying the result of determination of quality of continuity and insulation.

The measuring unit 902 applies a voltage between the two inspection pins selected from the inspection pins of the upper inspection jig 4 and the lower inspection jig 5 via the wiring 201 of the printed circuit board 2, and between them Measure the resistance value.

The storage unit 903 is usually composed of an HDD (Hard Disk Drive), and is used to store programs and data input from the input display unit 901, data of determination results, and the like.

The control unit 904 compares the resistance value measured by the measurement unit 902 with the resistance value of a good printed circuit board stored in the storage unit 903, and determines whether the target printed circuit board is conductive or insulated. The determination result is stored in the storage unit 903 and displayed on the input display unit 901 as necessary.

Next, each component of the inspection apparatus 1 shown in FIG. 1 will be described. First, the lifting unit 6 and the upper inspection jig 4 will be described. The lifting / lowering unit 6 moves the upper inspection jig 4 in the vertical direction.

The lifting unit 6 includes a top plate 602 supported by four columns 601 installed on the base 101, a plate 603 that supports the upper inspection jig 4, and a cylinder body attached to the top plate 602. An air cylinder 604 whose tip is fixed to the plate 603 via a joint, and a linear guide 606 that is attached to four corners of the plate 603 and guides the vertical movement of the plate 603 together with the column 601.

The upper inspection jig 4 is attached to the plate 603. Specifically, a pair of left and right long fixtures 607 and 607 are installed on the lower surface of the plate 603, and the left and right ends of the support plate 402 of the upper inspection jig 4 are inserted into the grooves of the fixture 607. By doing so, the upper inspection jig 4 is attached to the plate 603.

When the piston rod 605 of the air cylinder 604 is contracted, the plate 603 rises along the column 601, and conversely, when the piston rod 605 is extended, the plate 603 descends along the column 601. In the figure, tubes and pipes for supplying compressed air to the air cylinder 604 are omitted to avoid complication.

Next, the upper inspection jig 4 will be described. The upper inspection jig 4 includes an inspection board 401 having a plurality of inspection pins, a support plate 402 made of a flat plate-shaped synthetic resin for attaching the upper inspection jig 4 to the plate 603 of the elevating unit 6, and an inspection board It is composed of a plurality of columns 403 for fixing 401 to the support plate 402. Although not shown, the space between the inspection board 401 and the support plate 402 is a passage for a lead wire drawn out from the inspection pin of the inspection board 401.

FIG. 6 is a cross-sectional view of the main part of the inspection board 401. FIG. 6A shows a state before inspection, and FIG. 6B shows a state during inspection.

The inspection board 401 is a laminate of two boards 411 and 412 made of an insulating resin. A push member 413 and a probe 417 are attached to the main board 411, and a guide hole 424 for guiding the inspection pin is formed in the guide board 412.

The pushing member 413 presses the guide board 412 in a direction away from the main board 411. The pushing member 413 includes a bottomed cylindrical case 414 fixed to the main board 411, a columnar pushing pin 415 inserted into the case 414, and a compression spring 416 inserted between the case 414 and the pushing pin 415. It consists of The guide board 412 is separated from the main board 411 by the repulsive force of the compression spring 416 when not inspected.

The probe 417 abuts the inspection pin 418 on the inspection target portion (for example, the pad 203 shown in FIG. 5) during the inspection. The probe 417 is fixed to the inspection pin 418 and the main board 411. A bottomed cylindrical socket 419, a compression spring 420 inserted between the socket 419 and the rear end 421 of the inspection pin 418, and an insulating pipe 422 for preventing electric shock attached to the rear end of the socket 419 It consists of

The inspection pin 418, the compression spring 420, and the socket 419 are made of conductive metal, and a lead wire 423 is connected to the rear end of the socket 419. As shown in FIG. 6A, the inspection pin 418 is always biased toward the guide board 412 by the compression spring 420.

In FIG. 6, the pushing member 413 and the probe 417 are attached to the main board 411 one by one. However, in the actual inspection board 401, the pushing member 413 is arranged so that the force pushing the guide board 412 is equalized. These are attached to the four corners of the rectangular parallelepiped main board 411, respectively. Probes 417 are attached to positions on the printed circuit board 2 that are opposed to the inspection target portions.

At the time of inspection, when the upper inspection jig 4 is lowered by the elevating unit 6 and is brought into contact with the lower inspection jig 5 with the printed circuit board 2 and the tray 3 interposed therebetween, as shown in FIG. The compression spring 416 is contracted by the pressure. As a result, the tip of the inspection pin 418 is exposed from the guide hole 424 and contacts the wiring 201 of the printed circuit board 2.

As described above, since the inspection pin 418, the socket 419 and the compression spring 420 are made of a conductive material, when a constant voltage is applied between the two inspection pins 418 selected by the inspection unit 9. A current flows between the inspection pins via the wiring 201. When the resistance value between the inspection pins is measured by a measuring instrument built in the measuring unit 902 and the value is compared with the value of a non-defective printed circuit board stored in the storage unit 903 in the control unit 904, The quality of continuity and insulation can be determined.

In addition, the structure of the inspection board 401 shown in FIG. 6 is an example, and is not limited to this structure. An inspection board having another structure may be adopted as long as the same function can be exhibited.

Returning to the description of FIGS. 1 and 2, the lower inspection jig 5 will be described. The lower inspection jig 5 inspects the wiring formed on the lower surface of the printed circuit board 2. The inspection board 501 having a plurality of inspection pins and the lower inspection jig 5 are fixed to the base 101. And a plurality of support columns 503 for fixing the inspection board 501 to the support plate 502. Since the functions of the inspection board 501, the support plate 502, and the support column 503 are the same as the functions of the inspection board 401, the support plate 402, and the support column 403 of the upper inspection jig 4, description thereof will be omitted.

The lower inspection jig 5 is attached to a plate 102 fixed to the base 101. A pair of long fixtures 103 are provided on the left and right sides of the plate 102. By inserting the left and right ends of the support plate 502 of the lower inspection jig 5 into the grooves of the fixture 103, The inspection jig 5 is attached to the plate 102.

The difference between the upper inspection jig 4 and the lower inspection jig 5 described above is that the upper inspection jig 4 can be moved in the vertical direction by the lifting unit 6, whereas the lower inspection jig 5 is based on the plate 102. A guide pin 504 for positioning the printed circuit board 2 is attached to the point fixed to the base 101 and the inspection board 501, and a hole (not shown) for accommodating the guide pin 504 is provided at a position facing the upper inspection jig 4. ) Is formed.

By inserting guide pins 504 provided at four locations on the inspection board 501 into positioning holes 202 (see FIG. 4) formed at positions facing the printed circuit board 2, the printed circuit board 2 becomes a lower inspection jig. 5 is accurately positioned, and the inspection pin comes into contact with the wiring (for example, pad) 201 of the inspection object portion without error.

In the inspection, the lift unit 6 is driven to lower the plate 603, and the printed circuit board 2 placed on the tray 3 is sandwiched between the upper inspection jig 4 and the lower inspection jig 5. After the inspection is completed, the lift unit 6 is driven to raise the plate 603 and then held at the position shown in FIG.

Next, the substrate transfer unit 7 will be described with reference to FIGS. 1 and 2 and FIGS. 7 is a front view of the left unit of the pair of substrate transfer units 7 and 7 in FIG. 1, FIG. 8 is a plan view of the unit, and FIG. 9 is a side view of the unit.

In the figure, in order to avoid complications, tubes, valves, motors and various sensors for supplying compressed air to the air cylinder and wiring for connecting the control unit 8 are omitted. Further, although bolts and nuts for fixing the members are shown in the figure, these are general-purpose fastening members and will not be described with reference numerals.

As described above, the substrate transport unit 7 transports the tray 3 on which the printed circuit board 2 is placed in the horizontal direction. As shown in FIG. 2, a pair of slide tables 701 having a rectangular cross section are installed on the left and right sides of the lower inspection jig 5 along the movement path. The slide table 701 is a member for transporting the tray 3 in the horizontal direction. When a ball screw (not shown) accommodated in the table is rotated, the slide block 702 is indicated by an arrow A on the slide table 701. Move in the direction.

On the support plate 703 fixed to the slide block 702 by bolts, there are a member for moving the tray 3 in the vertical direction (direction indicated by an arrow B in FIG. 7) and a member for supporting the tray 3 to be conveyed. It is installed.

A guide mounting plate 704 and a first air cylinder 705 are mounted on the upper surface of the support plate 703 by bolts or the like. One end of the first connecting plate 707 is attached to the upper portion of the piston rod 706 of the air cylinder 705 via a joint, and the other end of the first connecting plate 707 is sandwiched between the guide attaching plate 704. An arm base 711 having an L-shaped cross section is attached.

1st linear guide 708 which guides the raising / lowering of the arm base 711 is attached to the side surface of the guide attachment plate 704. The first linear guide 708 includes a rail 709 attached to the guide attachment plate 704 and a block 710 attached to the arm base 711. When the connecting plate 707 is moved up and down by contracting or extending the piston rod 706 of the first air cylinder 705, the block 710 moves up and down along the rail 709, thereby enabling the arm base 711 to move up and down smoothly. Yes.

A tray base 712 having guide pins 713 installed at both ends is attached to the top surface of the tip of the arm base 711. As shown in FIG. 1, the end of the tray 3 is placed on the tray base 712. The tray 3 is transported. At this time, the guide pins 713 are inserted into the positioning holes 302 (see FIG. 3) formed at the end of the tray 3.

A second air cylinder 715 is attached to the lower surface of the first connecting plate 707, and a second connecting plate 717 having an L-shaped cross section is attached to the tip of the piston rod 716 via a joint. ing. Further, a pair of cylinder mounting plates 718 and 718 having a U-shaped cross section are attached to both ends of the second connecting plate 717 via bolts, respectively.

A third air cylinder 721 is accommodated in the groove of the cylinder mounting plate 718. The rear portion of the air cylinder 721 is rotatably attached to the cylinder attachment plate 718 via a pin 722, and the front end of the piston rod 723 is connected to the chuck 725 via a hinge pin 724.

The chuck 725 sandwiches the end of the tray 3 placed on the tray base 712, and is attached to the cylinder mounting plate 718 in a rotatable state via a pin 726 disposed at the lower part. When the piston rod 723 is contracted, the chuck 725 rotates counterclockwise around the pin 726 as shown by a two-dot chain line in FIG. 7, and the tray 3 is released from gripping by the chuck 725. A urethane sheet 727 is affixed to the lower surface of the chuck 725 to prevent rattling that occurs when the tray 3 is sandwiched between the chuck 725 and the tray base 712.

A second linear guide 731 is installed between the cylinder mounting plate 718 and the arm base 711. As shown in FIG. 9, the second linear guide 731 includes a rail 732 attached to the upper surface of the arm base 711 in parallel with the cylinder attachment plate 718 and a block 733 attached to the lower surface of the cylinder attachment plate 718. Then, the movement of the cylinder mounting plate 718 in the horizontal direction (the direction indicated by the arrow C in FIGS. 7 and 8) is guided.

The reason why the cylinder mounting plate 718 can be moved in the horizontal direction is to prevent the chuck 725 from getting in the way when the operator attaches the tray 3 to the tray base 712 or removes the tray 3 from the tray base 712. It is. As the cylinder mounting plate 718 moves backward, the chuck 725 is retracted to a position where the tray 3 does not contact.

<Operation of board inspection device>
Next, the operation of the inspection apparatus 1 according to the present invention will be described with reference to FIGS. 10 and 11 and the respective drawings described above. FIG. 10 is a flowchart showing the flow of the operation of the inspection apparatus 1, and FIG. 11 is a side view of the main part for explaining the operations of the upper inspection jig 4 and the lower inspection jig 5.

Before starting the work, the substrate transfer unit 7 stands by at the position shown in FIG. The tray table 712 is held at a position higher than the lower inspection jig 5. At this time, the chuck 725 is in an open state, and the chuck 725 is further retracted by the linear guide 731, so that it does not get in the way when the operator places the tray 3 on the tray base 712.

First, the operator attaches both end portions of the tray 3 to the tray bases 712 of the pair of substrate transport units 7 (step S11). The operator inserts the four guide pins 713 attached to the tray base 712 into the four positioning holes 302 (see FIG. 4) formed at both ends of the tray 3, respectively. It mounts on the stand 712 (refer FIG. 2).

Next, when the operator presses the button of the control unit 8, the piston rod 716 of the second air cylinder 715 extends and the cylinder mounting plate 718 advances, and then the piston rod 723 of the third air cylinder 721 extends. Then, the chuck 725 rotates around the pin 726 and grips the end of the tray 3 with the tray base 712 (see FIG. 7, step S12).

Next, as shown in FIG. 4B, the operator places the printed circuit board 2 on the tray 3, and sets the guide pins 301 of the tray 3 so that the printed circuit board 2 does not fall out of the tray 3. The second hole 202 is inserted (step S13). Thus, preparation for transporting the tray 3 is completed.

The subsequent operations are automatically performed based on the data stored in the storage unit 802 (see FIG. 3) of the control unit 8. When the operator presses the start button of the control unit 8, the slide table 701 is driven to move the slide block 702 in the horizontal direction, and the wiring pattern for the first inspection on the tray 3 is placed above the lower inspection jig 5. Transport until it comes (step S14)

This state is shown in FIG. The lower inspection jig 5 is positioned below the tray 3 held by the chuck 725, and the upper inspection jig 4 attached to the plate 603 of the lifting unit 6 is positioned above the tray 3.

When the slide block 702 moves to the designated position and stops, the first air cylinder 705 of the tray transport unit 7 is driven, the piston rod 706 is contracted, and the arm base 711 is lowered. As the arm base 711 is lowered, the piston rod 723 of the third air cylinder 721 contracts and the chuck 725 rotates around the pin 726 (see FIG. 7), and the tray 3 is released from the grip of the chuck 725. (Step S15).

The state is shown in FIG. At this time, four guide pins 504 attached to the lower inspection jig 5 are inserted into the four positioning holes 202 formed in the printed circuit board 2 through the holes 303 formed in the tray 3. . Since the diameter of the positioning hole 202 and the diameter of the base portion of the guide pin 504 are substantially equal, the printed circuit board 2 is accurately positioned by the guide pin 504.

Next, by driving the air cylinder 604 of the elevating unit 6 and extending the piston rod 605, the upper inspection jig 4 is lowered, and as shown in FIG. 11 (c), the inspection board 401 of the upper inspection jig 4 and The tray 3 is stopped while the tray 3 is sandwiched between the inspection boards 501 of the lower inspection jig 5 (step S16).

In a state where the tray 3 is sandwiched between the inspection board 401 of the upper inspection jig 4 and the inspection board 501 of the lower inspection jig 5, as shown in FIG. 6B, the compression spring 416 of the upper inspection jig 4 is pressed by pressure. The tip of the inspection pin 418 is exposed from the guide hole 424 and contacts the wiring 201 formed on the upper surface of the printed board 2.

The wiring 201 formed on the lower surface of the printed circuit board 2 is also formed on the lower surface of the printed circuit board 2 in the same manner as the upper inspection jig 4 because the compression spring contracts and the tip of the inspection pin is exposed from the guide hole. 201 is contacted.

In this state, the continuity or insulation of the printed circuit board 2 is inspected (step S17). Specifically, the measurement unit 902 of the inspection unit 9 applies a voltage between the two selected inspection pins 418, measures the resistance value between the inspection pins, and sends the value to the control unit 904. .

The control unit 904 compares the measured resistance value between the inspection pins with the resistance value of a non-defective printed circuit board stored in the storage unit 903, and determines whether the printed circuit board to be inspected is conductive or insulated. Pass / fail judgment is performed. The determination result is displayed on the input display unit 901 by the control unit 904 and further written in the storage unit 903.

When the inspection is completed, the air cylinder 604 of the elevating unit 6 is driven to contract the piston rod 605, whereby the upper inspection jig 4 is raised to the position shown in FIG. S18). The position of the upper inspection jig 4 shown in FIG. 11 (d) is set lower than the position of the upper inspection jig 4 shown in FIG. 11 (b). This is for shortening the descent time of the upper inspection jig 4 when performing the next inspection.

Next, the first air cylinder 705 of the substrate transport unit 7 is driven, the piston rod 706 is extended, the arm base 711 is raised, and the tray 3 is separated from the lower inspection jig 5. The third air cylinder 721 of the substrate transport unit 7 operates slightly later than the start of raising the tray 3, the piston rod 723 extends, the chuck 725 rotates clockwise around the pin 726, and between the tray table 712. Then, the end of the tray 3 is gripped again (step S19).

When the tray 3 is raised, the printed circuit board 2 fixed to the lower inspection jig 5 by the guide pins 504 is detached from the lower inspection jig 5 with the guide pins 504 removed from the positioning holes 202. Finally, the tray 3 is raised to the position shown in FIG.

The control unit 904 of the inspection unit 9 confirms from the inspection data stored in the storage unit 903 whether or not the inspection of all the wiring patterns on the printed circuit board 2 has been completed (step S20). (No in the same step), the process returns to step S14, and the processes of steps S14 to S19 are repeated.

On the other hand, when the control unit 904 determines that the inspection of all the wiring patterns of the printed circuit board 2 has been completed (Yes in step S20), the control unit 904 transmits data indicating that the inspection has been completed to the control unit 8. Thereafter, the control unit 8 raises the upper inspection jig 4 to the initial position shown in FIG. 11A, and drives the slide table 701 to move the substrate transport unit 7 to the initial position (step S21). Thereafter, the operator removes the printed circuit board 2 placed on the tray 3 from the tray 3 (step S22).

Although not shown in FIG. 10, the operator determines that conduction or insulation is poor among the printed circuit boards 2 removed from the tray 3 based on the inspection result displayed on the input display unit 901 of the inspection unit 9. A sticker on which an identification mark is displayed is pasted at the place of the printed wiring pattern.

The printed circuit board 2 on which the identification seal is affixed is separated for each wiring pattern by a cutter (not shown). Of the individually separated printed boards, the board with the identification sticker is discarded, and only good printed boards are shipped as products.

Returning to the description of FIG. 10, at the time when the process of step S22 is completed, the operator determines whether or not the inspection of all the printed circuit boards to be inspected has been completed (step S23), and the inspection has been completed. If there is no printed circuit board (No), the process returns to step S13 to place a new printed circuit board 2 on the tray 3.

On the other hand, when the inspection has been completed for all the printed boards (Yes in Step S23), the process proceeds to Step S24, and the operator removes the tray 3 from the board transport unit 7. Specifically, when the operator presses the button of the control unit 8, the piston rod 723 of the third air cylinder 721 of the substrate transport unit 7 is contracted, the chuck 725 is rotated around the pin 726, and the tray 3 is chucked. Release from gripping by 725. Further, the piston rod 716 of the second air cylinder 715 contracts and the chuck 725 moves backward.

Thereafter, the operator removes the tray 3 from the tray base 712. At this time, since the chuck 7 is in the retracted position, it does not get in the way when the tray 3 is removed from the tray base 712.

As described above, when the inspection apparatus according to the present embodiment is used, it is not necessary to consider warping or twisting of the flexible printed circuit board, so that the configuration of the apparatus is simplified, and as a result, the inspection apparatus can be manufactured at low cost. . Moreover, since the wiring on both sides of the printed circuit board can be inspected simultaneously, the time required for the inspection can be shortened.

In the present embodiment, air cylinders are used as driving means for the elevating unit 6 and the substrate transport unit 7, but the present invention is not limited to this. It goes without saying that the same function can be realized even if a hydraulic cylinder or an actuator driven by an electromagnet is used as the driving means.

(Embodiment 2)
In the present embodiment, a substrate reversing unit 11 and a punching unit 12 are installed in the vicinity of the rear portion of the slide table 701 of the inspection apparatus 1 according to the first embodiment. FIG. 12 shows the substrate reversing unit 11 and the punching unit 12 disposed in the vicinity of the rear portion of the slide table 701. Hereinafter, the reason and structure of providing each unit are demonstrated.

<Substrate reversing unit>
As shown in FIG. 4B described above, a plurality of the same wiring patterns are regularly formed on the printed circuit board 2. After the inspection of the printed circuit board 2 is completed, the printed circuit board 2 is cut and separated into individual printed circuit boards.

The wiring pattern shown in FIG. 4B will be further described. In each of the five wiring patterns arranged in the vertical direction, one wiring pattern and a wiring pattern obtained by inverting the wiring pattern are arranged close to each other. It is a thing. As described above, depending on the printed circuit board, in order to increase the wiring density, the wiring pattern direction may be reversed for each pitch.

When the individual wiring patterns are directed in the same direction, the entire board can be inspected simply by repeatedly carrying the printed board 2 by the board carrying unit 7. For example, when inspecting a pair of wiring patterns arranged on the left and right in one inspection, the upper inspection jig 4 and the lower inspection jig 5 having the number of inspection pins 418 corresponding to the pair of wiring patterns are used. By inspecting the printed circuit board 2 as a whole by repeating the inspection while shifting the wiring pattern by one pitch by the substrate transport unit 7.

On the other hand, when inspecting a printed circuit board in which the direction of the wiring pattern is reversed for each pitch, there are two types of inspection pins: an inspection pin corresponding to the forward arrangement pattern and an inspection pin corresponding to the reverse arrangement pattern. It is necessary to prepare an inspection jig having However, when the number of inspection pins is large, it is expensive to produce the inspection jigs 4 and 5, which causes an increase in cost.

Therefore, in the present embodiment, after the inspection of the wiring pattern in the forward direction is completed for such a printed circuit board, the printed circuit board is rotated by 180 degrees using the substrate reversing unit 11, and then the wiring pattern in the reverse direction is used. The wiring is inspected in the same manner as in the forward direction. In this way, it is not necessary to prepare an inspection jig having two types of inspection pins, so that inspection costs can be reduced.

The configuration and operation of the substrate reversing unit 11 will be described with reference to FIG. The substrate reversing unit 11 is controlled by the control unit 8 described in the first embodiment.

The substrate reversing unit 11 includes a table 111 on which the tray 3 transported by the substrate transport unit 7 is placed, an air cylinder 112 that rotates the table 111, and an air cylinder 113 that moves the table 111 up and down.

FIG. 12 shows the outline of the tray 3 placed on the table 111 with a two-dot chain line. Guide pins 114 are provided at the four corners of the table 111, respectively. By inserting the guide pins 114 into the holes formed at the opposite positions of the tray 3, the tray 3 is positioned with respect to the table 111 and further prevents the tray 3 from dropping from the table 111.

The rotating shaft of the air cylinder 112 which is a driving means is connected to the lower surface of the center of the table 111. Since the rotation shaft is installed at the intermediate point between the pair of slide tables 701 and 701, when the tray 3 placed on the table 111 is rotated 180 degrees by the air cylinder 113, the tray 3 is the same with respect to the slide table 701. Held in position.

The operation of the substrate reversing unit 11 will be described. When the table 111 is not in use, the piston rod (not shown) of the air cylinder 113 is contracted so as not to hinder the transport of the tray 3 by the substrate transport unit 7, so positioned.

The printed circuit board 2 for which the inspection of the wiring pattern in the forward direction has been completed is transported to the position indicated by the two-dot chain line in FIG. Thereafter, the tray 3 is released from the grip of the chuck 725, and the chuck 725 is further retracted to a position where it does not interfere with the removal of the tray 3 by the linear guide 731.

In this state, by driving the air cylinder 113, the table 111 is lifted and comes into contact with the tray 3 placed on the tray base 712 to lift the tray 3. At this time, the guide pin 114 is inserted into a hole formed at a position facing the tray 3.

The tray 3 stops above the tray base 712, and the air cylinder 112 rotates at that position to rotate the tray 3 180 degrees.

Next, the piston rod (not shown) of the air cylinder 113 is contracted to lower the table 111, and the inverted tray 3 is placed on the tray base 712. The table 111 is lowered to the bottom of the tray table 712 and then stops.

Thereafter, the chuck 725 moves forward by the linear guide 731 and further grips the end of the tray 3 placed on the tray base 712. The inverted tray 3 is transported to a position where the inspection by the inspection jigs 4 and 5 is performed, and the wiring pattern in the reverse direction is inspected according to the above-described procedure.

<Punching unit>
As described with reference to the flowchart of FIG. 10, the printed circuit board 2 that has been inspected is separated for each wiring pattern, and only a board that is determined to be non-defective is shipped. If an identification mark is given to a wiring pattern determined to have poor conduction or insulation failure at the time of separation, only the substrate needs to be discarded after the division, so that the time required for separation can be shortened.

In the first embodiment, the seal is pasted as an identification mark on the wiring pattern that is determined to be defective by the operator. However, in this method, manual operation by the operator is necessary, which causes an increase in cost. Furthermore, the time required for the inspection becomes longer.

In this embodiment, as means for solving this problem, there is provided identification mark applying means for applying an identification mark to a wiring pattern determined to be defective among the wiring patterns of the printed circuit board. Specifically, a hole is made as an identification mark in the wiring pattern determined to be defective using the punching unit 12 so that the wiring pattern determined to be poor conduction or insulation failure can be seen at a glance.

12, the punching unit 12 includes an upper puncher 121, a lower puncher 122, an air cylinder 123 that moves the lower puncher 122 up and down, and a slider 124 that moves the air cylinder 123 in the horizontal direction. The punching unit 12 is controlled by the control unit 8 in the same manner as the substrate reversing unit 11.

Although not shown, the upper puncher 121 and the lower puncher 122 are attached to the upper end portion and the lower end portion of the U-shaped arm, and are configured to be moved integrally in the horizontal direction by the slider 124. Note that the upper puncher 121 is also provided with an air cylinder for moving the puncher up and down. However, since this performs the same function as the air cylinder 123, it is omitted in FIG. is doing.

When the upper puncher 121 is not in operation, the upper puncher 121 is held at a position higher than the tray base 712 so as not to prevent the substrate transport unit 7 from transporting the tray 3 by driving an air cylinder (not shown). Similarly, the lower puncher 122 is held at a position lower than the tray base 712 by driving the air cylinder 123.

The operation of the punching unit 12 will be described. After the inspection is completed, the tray 3 is transported to the rear part of the slide table 701 by the substrate transport unit 7. When a defective wiring pattern on the printed circuit board 2 placed on the tray 3 comes on the slider 124, the substrate transport unit 7 stops. Thereafter, by driving the slider 124, the upper puncher 121 and the lower puncher 122 stop at a position where the opening 304 of the tray 3 is located.

In this state, when the air cylinder (not shown) is driven to lower the upper puncher 121 and the air cylinder 123 is driven to raise the lower puncher 122, the upper puncher 121 and the lower puncher 122 move the printed circuit board 2. Colliding in a sandwiched state, holes are formed in the printed circuit board 2 by punching.

In this way, the printed circuit board 2 in which the hole is formed in the wiring pattern having poor conduction or insulation failure is transported to the initial position by the board transport unit 7 and then removed from the tray 3 by the operator's hand.

The printed circuit board 2 removed from the tray 3 is separated for each wiring pattern. However, since the wiring pattern with poor conduction and insulation is perforated, the quality of the printed circuit board can be easily identified.

In this embodiment, the printed board is perforated as a mark for identifying a wiring pattern having poor conduction or insulation, but the identification mark is not limited to this. As described in the first embodiment, a sticker may be attached to a corresponding portion of the printed board.

Further, in the present embodiment, an air cylinder is used as a driving means for the substrate reversing unit 11 and the punching unit 12 as in the case of the lifting unit 6 and the substrate transport unit 7, but an actuator using a hydraulic cylinder or an electromagnet instead of these. It goes without saying that may be used.

Also, in FIG. 12, the table 111 of the substrate reversing unit 11 and the slider 124 of the punching unit 12 are installed in a partially overlapping state, but this is intended for effective use of space. If there is no hindrance to raising and lowering the table 111 and the lower puncher 122, there is no particular problem even if they are installed at overlapping positions.

DESCRIPTION OF SYMBOLS 1 Board inspection device 2 Printed circuit board 3 Tray 4 Upper inspection jig 5 Lower inspection jig 6 Lifting unit 7 Substrate conveyance unit 8 Control unit 9 Inspection unit 11 Substrate reversing unit 12 Punching unit 101 Base 102, 603 Plate 103, 607 Tool 111 Table 112 Rotating shaft 113, 123, 604, 705, 715, 721 Air cylinder 121 Upper puncher 122 Lower puncher 124 Slider 201 Wiring 202, 302, 303 Positioning hole 203 Pad 301, 504, 713 Guide pin 304 Opening 401 , 501 Inspection board 402, 502 Support plate 403, 503, 601 Post 411, 412 Board 413 Extrusion member 414 Case 415 Extrusion pin 416, 420 Compression spring 417 Probe 418 Inspection pin 19 Socket 422 Insulation pipe 423 Lead wire 602 Top plate 605, 706, 716, 723 Piston rod 606, 708, 731 Linear guide 701 Slide table 702 Slide block 704 Guide mounting plate 707, 717 Connection plate 711 Arm base 712 Tray base 718 Cylinder Mounting plate 724, 716 pin 727 Urethane foam 800 Processor 801, 901 Input display unit 802, 903 Storage unit 902 Measurement unit 904 Control unit

Claims (11)

1. An inspection pin is brought into contact with a predetermined portion of the wiring of the printed circuit board on which wiring is formed on at least one surface, and a voltage is applied between the selected two inspection pins via the wiring. A printed circuit board inspection device that inspects the continuity or insulation of a printed circuit board,
   A plate-like tray formed of an insulating material on which the printed circuit board is placed;
   An upper inspection jig for inspecting wiring on the upper surface of the printed circuit board and a lower inspection jig for inspecting wiring on the lower surface;
   The upper inspection jig placed above the lower inspection jig is lowered, and the printed circuit board placed on the tray is sandwiched between the upper inspection jig and the lower inspection jig, thereby An elevating unit for contacting the inspection pin of the inspection jig and the wiring of the printed circuit board;
   An inspection unit that applies a voltage between two selected inspection pins of the upper inspection jig and measures a resistance value between them;
   And a control unit for controlling the operation of the elevating unit.
2. The inspection pin of the lower inspection jig contacts the wiring on the lower surface of the printed circuit board through the opening formed in the tray,
   The print according to claim 1, wherein the inspection unit applies a voltage between two selected inspection pins of the upper inspection jig and the lower inspection jig and measures a resistance value therebetween. Board inspection equipment.
3. The printed circuit board inspection apparatus according to claim 1 or 2, wherein a first guide pin inserted into a positioning hole formed in the printed circuit board is attached to an upper surface of the tray.
4. The 2nd guide pin inserted in the hole for positioning formed in each of the said printed circuit board and a tray is attached to the upper surface of the said lower inspection jig. Printed circuit board inspection equipment.
5. A pair of substrate transport units that transport the printed circuit boards placed on the tray in the horizontal direction,
   The board transfer unit
   A tray base on which an end portion of the tray is placed and a third guide pin to be inserted into a positioning hole formed in the tray is attached to the upper surface;
   The printed circuit board inspection apparatus according to claim 1, further comprising: a chuck that grips the tray with the tray base.
6. The substrate transport unit is configured such that the tray table can move in the vertical direction,
   5. The print according to claim 4, wherein after the inspection is finished, the tray placed on the tray table is raised, and the second guide pin of the lower inspection jig is removed from the positioning hole of the printed circuit board. Board inspection equipment.
7. The substrate transport unit is
   When transporting the tray placed on the tray table, raise the tray table to a position where it does not contact the lower inspection jig,
   The printed circuit board inspection apparatus according to claim 5 or 6, wherein when performing inspection, the tray base is lowered to a position where the tray is placed on the lower inspection jig.
8. The printed circuit board inspection apparatus according to any one of claims 5 to 7, wherein the substrate transport unit releases gripping of the tray by the chuck when the tray is placed on the lower inspection jig.
9. A substrate reversing unit for reversing the direction of the printed circuit board placed on the tray is installed between a pair of slide tables installed along the movement path of the pair of substrate transport units,
   The substrate reversing unit is
   A table on which the tray is placed;
   Rotating means for rotating the table;
   9. The printed circuit board inspection apparatus according to claim 1, further comprising a first lifting / lowering unit that moves the table in a vertical direction.
10. Among the plurality of wiring patterns formed on the printed circuit board between the pair of slide tables installed along the movement path of the pair of substrate transport units, the wiring patterns determined to be defective in conduction or insulation are identified. The printed circuit board inspection apparatus according to claim 1, wherein identification mark applying means for applying the mark is provided.
11. The identification mark applying means is composed of a punching unit,
    The punching unit is
    An upper puncher and a lower puncher that collide with each other so as to sandwich the printed circuit board and open a hole in the printed circuit board;
    A slider for moving the upper puncher and the lower puncher in a direction perpendicular to the transport direction by the substrate transport unit;
    The printed circuit board inspection apparatus according to claim 10, further comprising second and third elevating units that move the upper puncher and the lower puncher in the vertical direction.

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