TWI731760B - Circuit board warpage detection device - Google Patents

Abstract

A circuit board warpage detection device is mainly provided with a first detection group and a second detection group on a base, installed on the base, a lifting platform and a position switching platform, and cooperates with a first transfer unit And a second transfer unit to transfer the circuit board to be tested. When the lifting platform is in the use position and the position switching platform is in the second position, the second transmitter is aligned with the second receiver, and the first receiver is aligned with the first transmitter. Receive signals in the aligned state. When the lifting platform is in the unused position and the position switching platform is in the first position, the first transmitter is aligned with the second receiver, and the first receiver is not aligned with the first transmitter, and the second transmitter is not aligned with the first transmitter. The transmitter is not aimed at the second receiver.

Description

Circuit board warpage detection device

The invention is related to the detection technology of the circuit board, in particular to a circuit board warpage detection device.

my country's new patent No. 483617 discloses a circuit board warpage inspection machine. The case is mainly to place the circuit board on the conveyor belt, and then use the laser inspection machine above the conveyor belt to check the circuit board warpage.

The aforementioned prior art only discloses the technology of using a conveyor belt to transfer circuit boards, which can only detect circuit boards smaller than the width of the conveyor belt, and cannot detect circuit boards larger than the width of the conveyor belt. As a result, when the circuit board to be inspected on the client is wider, a larger-size circuit board warpage inspection machine is required. This kind of device that can only detect limited-size circuit boards has no size flexibility and poor applicability. In addition, the aforementioned prior art only uses one conveyor belt, so it can only inspect one piece at a time, even a small-sized circuit board is one piece at a time. If there are two runners, the small-sized circuit board can detect two pieces at the same time. Can improve efficiency.

The main purpose of the present invention is to solve the aforementioned problems of the prior art. Therefore, a circuit board warpage detection device is provided, which has two transfer units for conveying and can detect a circuit board with a larger width than one transfer unit for conveying. , Or separately detect two circuit boards with the same width or smaller width than a transfer unit for conveying.

Based on the above, a circuit board warpage detection device provided by the present invention includes: a base; a first transfer unit, which is provided on the base, and has a first transfer surface, the first transfer surface The circuit board carried by it is moved from one side of the base to the other side; a second transfer unit is arranged on the base and has a second transfer surface, which is essentially The upper part is the same height as the first transfer surface, the second transfer surface moves the circuit board it carries from one side of the base to the other side, and the transfer direction of the second transfer unit is essentially The upper part is parallel to the transfer direction of the first transfer unit, the second transfer unit and the first transfer unit are separated by a predetermined distance to form an intermediate area therebetween; a lifting unit is provided on the base And it corresponds to the middle area, and has a lifting platform that can be driven to move up and down between a used position and an unused position; a position switching unit is provided on the base and located at a side of the second transfer unit On the side, there is a position switching platform that can be driven to switch between a first position and a second position; a first detection group has a first transmitter and a first receiver, the first transmitter is set On the base, the first receiver is provided on the lifting platform; and a second detection group has a second transmitter and a second receiver, the second emitter is provided on the lifting platform, and the second The receiver is set in the position switcher. When the elevator is in the use position and the position switcher is in the second position, the second transmitter is aligned with the second receiver, and the second receiver is ready to use To receive the signal from the second transmitter in the aligned state, and the first receiver is aligned with the first transmitter to receive the signal from the first transmitter in the aligned state; Wherein, when the lifting platform is in the unused position and the position switching platform is in the first position, the first transmitter is aligned with the second receiver, and the first receiver is not aligned with the first transmitter, And the second transmitter is not aligned with the second receiver; wherein, when the lifting platform is in the use position, the first transmitter, the first receiver, the second transmitter and the second receiver are A part is lower than the first transfer surface and the second transfer surface, and a part is higher than the first transfer surface and the second transfer surface.

Thereby, the present invention has two transfer units for conveying, which can be combined to transfer a circuit board with a larger width than one transfer unit for conveying for inspection, or to test separately than one transfer unit for conveying. Two circuit boards with the same or smaller width have better applicability.

In order to describe the technical features of the present invention in detail, the following preferred embodiments are described in conjunction with the drawings, in which:

As shown in FIGS. 1 to 6, a circuit board warpage detection device 10 provided by a preferred embodiment of the present invention is mainly composed of a base 11, a first transfer unit 21, and a second transfer unit 31 , A lifting unit 41, a position switching unit 51, a first detection group 61 and a second detection group 71, wherein:

The base 11 has an empty bridge 12.

The first transfer unit 21 is disposed on the base 11 and has a first transfer surface 22. The first transfer surface 22 transfers the circuit board 99 (shown in FIG. 5) it carries from the base 11 One side of the seat 11 moves to the other side. In this embodiment, the first transfer unit 21 takes a conveyor belt as an example, and the surface of the conveyor belt is used as the first transfer surface 22, because the structure and driving mode of the conveyor belt are well known. , And it is not the technical focus of this case, so I won’t repeat it.

The second transfer unit 31 is disposed on the base 11 and has a second transfer surface 32. The second transfer surface 32 is substantially the same height as the first transfer surface 22, and the second transfer surface 32 is substantially the same height as the first transfer surface 22. The surface 32 moves the circuit board 99 carried by it from one side of the base 11 to the other side. The transfer direction of the second transfer unit 31 is substantially parallel to the transfer direction of the first transfer unit 21, and the second transfer unit 31 is separated from the first transfer unit 21 by a predetermined distance. An intermediate area 14 is formed therebetween. In this embodiment, the second transfer unit 31 is a conveyor belt as an example, and the conveyor belt surface is used as the second transfer surface 32. As for the intermediate area 14, as shown in FIGS. 1 to 2 As shown, the metal plate is covered with a space, and the surface of the metal plate is lower than the first transfer surface 22 and the second transfer surface 32, so that the intermediate area 14 can be free from any object blocking The larger circuit board 99' (shown in FIG. 9) to be tested passes.

The empty bridge 12 spans over the first transfer surface 22 and the second transfer surface 32.

The lifting unit 41 is disposed on the empty bridge 12 of the base 11 and corresponds to the intermediate area 14, and has a lifting platform 42 that can be driven to move up and down between a use position UP and an unused position NUP, The lifting platform 42 is located above the intermediate area 14, and the non-use position NUP is higher than the use position UP. In this embodiment, the lifting unit 41 takes a driving screw group as an example. Since the driving screw group is composed of a slider, a screw, and a motor, its structure is very well-known and not the technical focus of this case. It goes into details. In addition, the lifting unit 41 can also be a conventional component such as a pneumatic cylinder or a belt-type sliding table, which can be selected according to requirements.

The position switching unit 51 is disposed on the base 11 and located on one side of the second transfer unit 31, and has a position switching table 52 that can be driven to switch between a first position P1 and a second position P2 , And the virtual connection direction between the first position P1 and the second position P2 is parallel to the transfer direction of the second transfer unit 31. In this embodiment, the position switching unit 51 takes a drive screw group as an example, but it can also be a conventional component such as an air cylinder or a belt-type sliding table, which can be selected as required. .

The first detection group 61 has a first transmitter 62 and a first receiver 64, the first transmitter 62 is disposed on the base 11, and the first receiver 64 is disposed on the lifting platform 42. In actual implementation, the first transmitter 62 is a laser light transmitter, the first receiver 64 is a laser light receiver, and the direction in which the first transmitter 62 emits signals is substantially perpendicular to the first transmitter. The vertical relationship of the transfer direction of the transfer unit 21 helps to keep the signal transmission and reception at the shortest distance, and can achieve the most effective reception effect.

The second detection group 71 has a second transmitter 72 and a second receiver 74, the second transmitter 72 is disposed on the lifting platform 42, and the second receiver 74 is disposed on the position switching platform 52. When the lifting platform 42 is at the use position UP and the position switching platform 52 is at the second position P2, the second transmitter 72 is aligned with the second receiver 74, and the second receiver 74 is used for The signal sent by the second transmitter 72 is received in the aligned state, and the first receiver 64 is aligned with the first transmitter 62 to receive the signal sent by the first transmitter 62 in the aligned state In addition, the first receiver 64 and the second transmitter 72 are located under the air bridge 12. In actual implementation, the second transmitter 72 is a laser light transmitter, the second receiver 74 is a laser light receiver, and the direction in which the second transmitter 72 emits signals is substantially perpendicular to the second transmitter. In the transfer direction of the transfer unit 31, the signals emitted by the first transmitter 62 and the second transmitter 72 are multiple parallel laser beams arranged up and down. As shown in FIGS. 7A to 7C, when a normal circuit board 99 without warpage or a circuit board 99 with warpage passes through multiple parallel laser beams, the degree of warping can be judged by the amount of blocked laser beams.

As shown in FIG. 4 in conjunction with other figures, when the setting is set, the system is set to: when the lifting platform 42 is in the use position UP, the first transmitter 62, the first receiver 64, and the second transmitter 72 And the second receiver 74 are partly lower than the first transfer surface 22 and the second transfer surface 32, and partly higher than the first transfer surface 22 and the second transfer surface 32, such a Then, the signals emitted by the first transmitter 62 and the second transmitter 72 are partly higher than the first transfer surface 22 and the second transfer surface 32, and some are lower than the first transfer surface The surface 22 and the second transfer surface 32. When the circuit board 99 is moved and passes the first transmitter 62 or the second transmitter 72, it will block some of its signals, making some of the signals of the first receiver 64 and the second receiver 74 unavailable. After receiving it, it is determined that a circuit board 99 has passed by. If the circuit board 99 is warped, when the circuit board 99 is moved and passes through the first transmitter 62 or the second transmitter 72, more signals will be blocked, and it can be determined that the circuit is there. The board 99 passes, and the circuit board 99 warps. In addition, the degree of warpage of the circuit board 99 can also be judged according to the number of blocked signals.

Wherein, when the lifting platform 42 is at the unused position NUP and the position switching platform 52 is at the first position P1, the first transmitter 62 is aligned with the second receiver 74, and the first receiver 64 is not aligned The first transmitter 62 and the second transmitter 72 are not aligned with the second receiver 74. In addition, since the first receiver 64 and the second transmitter 72 are moved from the original lower use position UP to the higher non-use position NUP, they are higher in vertical height than the first transfer position. The surface 22 and the second transfer surface 32 are separated by a predetermined distance, and the intermediate region 14 is at the same height as the surface of the first transfer surface 22 and the second transfer surface 32, that is, there is no object blocking it. It can pass the larger circuit board 99'.

The architecture of this embodiment is explained above, and then the operation state of this embodiment is explained. When this embodiment is in operation, it can be divided into two states. The first state is the first transfer unit 21 and the second transfer Each of the loading units 31 detects a circuit board 99. In this state, each circuit board 99 is less than or equal to the width of the first transfer surface 22 or the second transfer surface 32; the second state is a A larger circuit board 99' is placed on the first transfer unit 21 and the second transfer unit 31, and crosses the middle area 14 for inspection.

As shown in FIGS. 5 to 6, in the first state, the lifting platform 42 for operating the lifting unit 41 is located at the use position UP, and the operating position switching platform 52 is located at the second position P2. At this time, the second receiver 74 is aligned with the second transmitter 72 to receive the signal sent by the second transmitter 72, and the first receiver 64 is aligned with the first transmitter 62 to receive the signal sent by the second transmitter 72. The signal sent by the first transmitter 62 is received. In this situation, if the inspection is to be performed, the circuit board 99 to be inspected is placed on the first transfer surface 22 and the second transfer surface 32 and transferred, and the circuit board 99 passes through the When the first transmitter 62 and the second transmitter 72 emit signals, the amount of blocking signals is used to determine whether the circuit board 99 is warped and the degree of warping. In this state, the first detection group 61 operates independently to complete the detection, and the second detection group 71 also operates independently to complete the detection.

As shown in FIGS. 8 to 9, in the second state, the lifting platform 42 for operating the lifting unit 41 is located at the unused position NUP, and the operating position switching platform 52 is located at the first position P1. At this time, the first receiver 64 and the second transmitter 72 are raised to leave their original positions, and the second receiver 74 is aligned with the first transmitter 62 to receive the first transmitter 62 The signal sent out. In this situation, when testing is desired, a larger circuit board 99' can be placed across the middle area 14 on the first transfer surface 22 and the second transfer surface 32, and operate the The first transfer unit 21 and the second transfer unit 31 are synchronously driven to transfer, and when the larger circuit board 99' passes the signal of the first transmitter 62, it is judged according to the amount of blocked signal. Whether the larger circuit board 99' has warpage and the degree of warpage. In this state, the first transmitter 62 and the second receiver 74 jointly form a detection mechanism for detection, which is different from the aforementioned first state.

It can be seen from the above that the present invention has two transfer units 21, 31 for conveying, which can detect a circuit board 99' whose width is larger than that of a transfer unit for conveying, or separately detect a transfer unit that is larger than a transfer unit for conveying. 21, 31 two circuit boards 99 with the same width or smaller, and have wider applicability.

It is worth mentioning that the aforementioned empty bridge 12 is applicable to the state where the lifting unit 41 is installed on the base 11 and located above the first transfer surface 22 and the second transfer surface 32, and is an implementation State. If the lifting unit 41 is to be installed on the base 11 and located below the first transfer surface 22 and the second transfer surface 32, it is necessary to reserve space in the intermediate area 14 for the lifting unit 41 to descend, but Such a structure can be directly understood from this description, and there should be no need to express it in a diagram.

The aforementioned first detection group 61 and the second detection group 71 both use a transmitter and a receiver for signal transmission and reception. However, there are other ways to produce similar functions, such as transmission and The received component is integrated into one component and arranged on one side of the aforementioned transfer unit, while the opposite side uses a reflector to reflect the signal. In this way, the signal can be transmitted from one side to the opposite side of the reflector and reflected again Return the transmitting and receiving components to receive signals. The specific implementation is shown in FIG. 10 and FIG. 11. The difference from the technology disclosed in the previous embodiment is that the first detection group 61' has a first transmitter and receiver 62' and a first reflector. 64', the first transmitter and receiver 62' is located on the base 11', the first reflector 64' is located on the lifting platform 42'; the second detection group 71' has a second transmitter and The receiver 72' and a second reflector 74', the second transmitter and receiver 72' are arranged on the lifting platform 42', and the second reflector 74' is arranged on the position switching platform 52', in the lifting platform 42' is in the use position UP and the position switcher 52' is in the second position P2, the second transmitter and receiver 72' is aligned with the second reflector 74', and the second reflector 74' is It is used to reflect the signal sent by the second transmitter and receiver 72' in the aligned state and allow the second transmitter and receiver 72' to receive the signal, and the first reflector 64' is aligned with the first The transmitter and receiver 62' is used to reflect the signal sent by the first transmitter and receiver 62' in the aligned state and allow the first transmitter and receiver 62' to receive the signal. When the lifting platform 42' is located at the unused position NUP and the position switching platform 52' is located at the first position P1 (refer to FIG. 8), the first transmitter and receiver 62' is aligned with the second reflector 74' , And the first reflector 64' is not aligned with the first transmitter and receiver 62', and the second transmitter and receiver 72' is not aligned with the second reflector 74', thereby the second reflector 74' It reflects the signal sent by the first transmitter and receiver 62' and allows the first transmitter and receiver 62' to receive the signal. This structure can also achieve the effect of transmitting and receiving signals, and can also detect the warpage of the circuit board.

As far as the equivalent structure is concerned, although the aforementioned transfer units 21 and 31 are based on conveyor belts, they are not limited to conveyor belts. Other similar structures, such as movable transfer platforms, can also be used as transfer units. Covered by the patent scope of this case.

In addition, although two transfer units 21 and 31 are used as an example, in actual implementation, more transfer units can be set according to the needs, as long as an intermediate area is reserved between the two transfer units. Put the transmitter or receiver or reflector so that more circuit boards can be inspected at the same time, and larger circuit boards can also be inspected.

10: Circuit board warpage detection device 11: Pedestal 12: Sky Bridge 14: Middle area 21: The first transfer unit 22: The first transfer surface 31: The second transfer unit 32: The second transfer surface 41: Lifting unit 42: Lifting platform 51: Position switching unit 52: position switcher 61: The first detection group 62: First Launcher 64: first receiver 71: The second detection group 72: second transmitter 74: second receiver 99: circuit board 11’: Pedestal 42’: Lifting platform 52’: Position switcher 61’: First detection group 62’: First transmitter and receiver 64’: First reflector 71’: The second inspection group 72’: Second transmitter and receiver 74’: Second reflector 99’: Larger circuit board P1: first position P2: second position UP: Use location NUP: Do not use location

Figure 1 is a combined perspective view of a preferred embodiment of the present invention. FIG. 2 is a top view of a preferred embodiment of the present invention, showing the state after the empty bridge and part of the lifting device are removed. Figure 3 is a front view of a preferred embodiment of the present invention. Fig. 4 is a cross-sectional view taken along the line 4-4 in Fig. 3; Figure 5 is a diagram of the operating state of a preferred embodiment of the present invention. Fig. 6 is a right side view of Fig. 5. FIG. 7A is a schematic diagram of the operation of a preferred embodiment of the present invention, showing the state of detecting a normal unwarped circuit board. FIG. 7B is a schematic diagram of the operation of a preferred embodiment of the present invention, showing the state of detecting a circuit board with a low degree of warpage. FIG. 7C is a schematic diagram of the operation of a preferred embodiment of the present invention, showing the state of detecting a circuit board with a higher degree of warpage. Fig. 8 is another operation state diagram of a preferred embodiment of the present invention, showing the state of the lifting platform after it is raised. Fig. 9 is a top view of Fig. 8, showing the state after the empty bridge and the lifting device are removed. Fig. 10 is similar to Fig. 2 and is a top view of a preferred embodiment of the present invention, showing the position and form of the first reflector and the second reflector. Fig. 11 is similar to Fig. 3 and is a front view of a preferred embodiment of the present invention, showing the positions of the first reflector and the second reflector.

11: Pedestal

14: Middle area

21: The first transfer unit

22: The first transfer surface

31: The second transfer unit

32: The second transfer surface

52: position switcher

61: The first detection group

62: First Launcher

64: first receiver

71: The second detection group

72: second transmitter

74: second receiver

99: circuit board

P2: second position

Claims (10)

A circuit board warpage detection device, comprising: a base; a first transfer unit, arranged on the base, and having a first transfer surface, the first transfer surface is the circuit carried by it The board is moved from one side of the base to the other side; a second transfer unit is arranged on the base and has a second transfer surface which is substantially the same as the first transfer surface The second transfer surface moves the circuit board it carries from one side of the base to the other side, and the transfer direction of the second transfer unit is substantially parallel to the first transfer surface. The transfer direction of the loading unit, the second transfer unit and the first transfer unit are separated by a predetermined distance to form an intermediate area therebetween; a lifting unit is provided on the base and corresponds to the intermediate area, And there is a lifting platform that can be driven to move up and down between an in-use position and an unused position; a position switching unit, arranged on the base and located on one side of the second transfer unit, has a position switching platform It can be driven to switch between a first position and a second position; a first detection group has a first transmitter and a first receiver, the first transmitter is arranged on the base, and the second A receiver is provided on the lifting platform; and a second detection group has a second transmitter and a second receiver, the second transmitter is provided on the lifting platform, and the second receiver is provided at the position switch When the lifting platform is in the use position and the position switching platform is in the second position, the second transmitter is aligned with the second receiver, and the second receiver is used to receive in the aligned state The signal sent by the second transmitter, and the first receiver is aligned with the first transmitter to receive the signal sent by the first transmitter in the aligned state; Wherein, when the lifting platform is in the unused position and the position switching platform is in the first position, the first transmitter is aligned with the second receiver, and the first receiver is not aligned with the first transmitter, And the second transmitter is not aligned with the second receiver; wherein, when the lifting platform is in the use position, the first transmitter, the first receiver, the second transmitter and the second receiver are A part is lower than the first transfer surface and the second transfer surface, and a part is higher than the first transfer surface and the second transfer surface. The circuit board warpage detection device according to claim 1, wherein: when the lifting platform is in the use position, the signals emitted by the first transmitter and the second transmitter are partially higher than the first shift The loading surface and the second transfer surface are partially lower than the first transfer surface and the second transfer surface, and the signals emitted by the first transmitter and the second transmitter are arranged up and down Multiple parallel beams. The circuit board warpage detection device according to claim 1, wherein: when the lifting platform is in the unused position, the first receiver and the second transmitter are both vertically aligned with the first transfer surface And the second transfer surface are separated by a predetermined distance. The circuit board warpage detection device according to claim 3, wherein: when the lifting platform is in the unused position, the intermediate area is at the same height as the surfaces of the first transfer surface and the second transfer surface The position is not obstructed by any objects and can be passed by the circuit board. The circuit board warpage detection device according to claim 1, wherein: the base has an empty bridge across the first transfer surface and the second transfer surface, and the lifting unit is provided on the empty bridge When the lifting platform is in the use position, the first receiver and the second transmitter are located under the air bridge. The circuit board warpage detection device according to claim 1, wherein: the direction in which the first transmitter transmits signals is substantially perpendicular to the direction in which the first transfer unit is transferred; the direction in which the second transmitter transmits signals It is substantially perpendicular to the transfer direction of the second transfer unit. A circuit board warpage detection device, comprising: a base; a first transfer unit, arranged on the base, and having a first transfer surface, the first transfer surface is the circuit carried by it The board is moved from one side of the base to the other side; a second transfer unit is arranged on the base and has a second transfer surface which is substantially the same as the first transfer surface The second transfer surface moves the circuit board it carries from one side of the base to the other side, and the transfer direction of the second transfer unit is substantially parallel to the first transfer surface. The transfer direction of the loading unit, the second transfer unit and the first transfer unit are separated by a predetermined distance to form an intermediate area therebetween; a lifting unit is provided on the base and corresponds to the intermediate area, And there is a lifting platform that can be driven to move up and down between an in-use position and an unused position; a position switching unit, arranged on the base and located on one side of the second transfer unit, has a position switching platform Can be driven to switch between a first position and a second position; a first detection group has a first transmitter and receiver and a first reflector, the first transmitter and receiver are arranged on the base Seat, the first reflector is provided on the lifting platform; and a second detection group has a second transmitter and receiver and a second reflector, the second transmitter and receiver are provided on the lifting platform, the first Two reflectors are provided in the position switcher. When the lifting platform is in the use position and the position switcher is in the second position, the second transmitter and receiver are aligned with the second reflector, and the second reflector The device is used to reflect the second transmitter and receiver in the aligned state The signal and let the second transmitter and receiver receive the signal, and the first reflector is aligned with the first transmitter and receiver to reflect the signal emitted by the first transmitter and receiver in the aligned state Signal and allow the first transmitter and receiver to receive the signal; wherein, when the elevator platform is in the unused position and the position switcher is in the first position, the first transmitter and receiver are aligned with the second reflection And the first reflector is not aligned with the first transmitter and receiver, and the second transmitter and receiver is not aligned with the second reflector; wherein, when the lifting platform is in the use position, the first transmitter And the receiver, the first reflector, the second transmitter and receiver, and the second reflector are partially lower than the first transfer surface and the second transfer surface, and some are higher than the first transfer surface The loading surface and the second transfer surface. The circuit board warpage detection device according to claim 7, wherein: when the lifting platform is in the unused position, the first reflector and the second transmitter and receiver are both vertically higher than the first shifter. The loading surface and the second transfer surface are separated by a predetermined distance. The circuit board warpage detection device according to claim 8, wherein: when the lifting platform is in the unused position, the intermediate area is at the same height as the surfaces of the first transfer surface and the second transfer surface The position is not obstructed by any objects and can be passed by the circuit board. The circuit board warpage detection device according to claim 7, wherein: the base has an empty bridge across the first transfer surface and the second transfer surface, and the lifting unit is arranged on the empty bridge When the lifting platform is in the use position, the first reflector and the second transmitter and receiver are located under the air bridge.

Images