TWI386125B - System and method for delivering printed circuit board - Google Patents

Description

Circuit board transfer system and board transfer method

The present invention relates to the field of circuit board technologies, and in particular, to a circuit board transmission system and a circuit board transmission method.

The circuit board manufacturing process usually includes the steps of blanking, conductive circuit fabrication, via hole fabrication, solder mask printing, gold plating, and the like. The blanking refers to cutting a raw material such as a copper clad laminate into a substrate of an appropriate size for ease of production. Conductive circuit fabrication refers to the formation of a conductive pattern on a copper foil on a substrate, generally formed by coating photoresist, exposure development, etching lines, and photoresist removal. See Moon-Youn Jung et al. "Novel lithography process for extreme deep trench by using laminated negative dry film resist", IEEE 17th International Conference on Micro Electro Mechanical Systems. The manufacturing process of the via hole includes drilling and hole plating to realize interconnection of interlayer conductive lines. After the conductive circuit and the via hole are completed, a solder resist layer is applied on the surface of the conductive line of the substrate (except the terminating end point) to avoid oxidation of the conductive line, and to avoid damage to the conductive line during subsequent mounting, thereby causing soldering. Short circuit. Gold plating refers to the plating of a highly chemically inactive gold layer on the termination of the board to protect the termination terminals while providing good electrical conductivity.

The conductive circuit of the circuit board is generally fabricated on a conveyor belt, that is, the circuit board is first placed on the conveyor belt, and then the circuit board is transported to the photoresist coater, the exposure mask, the developing machine, and the etching liquid spray by the conveyor belt. Drenching And a stripping machine to complete the production of conductive lines. However, when the circuit board is manually placed on the conveyor belt, the speed of the board is not easily controlled, so that the spacing of the boards on the conveyor belt is uneven, which is not convenient for subsequent processes.

Therefore, it is necessary to provide a board transfer system and a board transfer method which can effectively control the board pitch.

A circuit board transfer system and a circuit board transfer method will be described below by way of embodiments.

A circuit board transport system includes a first transfer device, a second transfer device, an inductive device, and a controller. The first transfer device and the second transfer device are disposed adjacent to each other in the board transfer direction. The sensing device includes a first sensor and a second sensor disposed adjacent to each other, the first sensor is disposed above the first transmitting device and adjacent to the second transmitting device, and the second sensor is disposed above the second transmitting device and close to First conveyor. The sensing device is configured to sense two adjacent locations of the circuit boards respectively located at the first transmitting device and the second transmitting device. The controller has a timing circuit and a control circuit, and the timing circuit is connected to the first inductor and the second inductor for obtaining a circuit board of the two adjacent circuit boards located at the second transmitting device When the sensing range of the second sensor reaches the time when the circuit board of the first transmitting device enters the sensing range of the first sensor in the two adjacent circuit boards, the control circuit and the timing circuit, The first inductor and the first driving device have an electrical connection for adjusting the first transmission according to the time obtained by the timing circuit, the distance between the first inductor and the second inductor, and the transmission speed of the second transmitting device The delivery speed of the delivery device.

A circuit board transfer method comprising the steps of: providing a circuit board transfer system as described above and a plurality of circuit boards, wherein the plurality of circuit boards are sequentially transferred from the first transfer device to the second transfer device, and any two of the plurality of circuit boards are adjacent The circuit board that is first transferred to the second transfer device is the nth circuit board, and the circuit board that is transferred to the second transfer device is the n+1th circuit board; when the nth circuit board leaves the first When the sensing range of the two sensors is used, the second sensor causes the controller to start timing; when the first sensor senses that the n+1th circuit board enters the sensing range of the first sensor, the first sensor stops the controller Timing; the controller according to the sensing range of the nth circuit board leaving the second sensor until the first sensor senses the time between the n+1th circuit board entering the sensing range of the first sensor, the first sensor and the first The distance between the two inductors and the transfer speed of the second transfer device obtains the distance between the nth circuit board and the n+1th circuit board, thereby controlling the transfer speed of the first transfer device to adjust the pitch to a predetermined pitch.

The circuit board transmission system in the technical solution includes an inductive device and a controller, and the controller can adjust the transmission speed of the first transmitting device by using the acquired time and the sensing result of the first sensor and the second sensor, thereby adjusting The distance between the adjacent nth circuit board and the n+1th circuit board is such that the distance between the two circuit boards is within a predetermined pitch range. The circuit board transmission method of the technical solution can prevent the distance between the circuit boards from being too small or too large, thereby facilitating the subsequent processes.

The circuit board transmission system and the circuit board transmission method provided by the present technical solution will be further described in detail below with reference to the accompanying drawings and embodiments.

Referring to FIG. 1 , a circuit board transmission system 10 provided by an embodiment of the present technical solution includes a first transmission device 11 , a second transmission device 12 , an induction device 13 , and a controller 14 .

The first conveyor 11 and the second conveyor 12 are used to transport a circuit board. The first transfer device 11 and the second transfer device 12 are disposed adjacent to each other in the board transfer direction, so that the circuit board can be transferred from the first transfer device 11 to the second transfer device 12, and the circuit board is further transferred from the second transfer device 12 Transfer to a subsequent processing device, such as a Develeping/Etching/Stripping (DES) device.

In the present embodiment, the first conveying device 11 includes a conveyor belt 111, a first driving wheel 112, a second driving wheel 113, and a first driving device 114. The first driving device 114 is connected to the first driving wheel 111 and the second driving wheel 112 by the conveyor belt 111 for driving the conveyor belt 111 to move and driving the first driving wheel 112 and the second driving wheel 113 to rotate. The first driving wheel 112 and the second driving wheel 113 are disposed on both sides of the first driving device 114 for extending the conveyor belt 111. The conveyor belt 111 is used to transport a circuit board placed thereon. Of course, the first transfer device 11 can also be a structure of other transferable circuit boards.

The second conveyor 12 includes a plurality of transmission wheels 121 and at least one second drive unit 122. The plurality of transmission wheels 121 are sequentially arranged in the board conveying direction, and their axes are perpendicular to the board conveying direction. The second driving device 122 can be a motor and is connected to the plurality of transmission wheels 121 by a belt 123. Therefore, the plurality of transmission wheels 121 are rotated, and the rotation of the plurality of transmission wheels 121 can transmit the circuit board placed thereon. Of course, the second driving device 122 can also be connected to the transmission wheel 121 by gears or other components.

The distance between the first conveyor 11 and the second conveyor 12 should be less than one-half the length of one of the boards to prevent the board from falling during transport. For example, when the length of the board in actual production is 200 mm, the distance between the first conveyor 11 and the second conveyor 12 is preferably 15 to 80 mm.

The sensing device 13 includes a first inductor 131 and a second inductor 132 for sensing a transfer position of the circuit board. The first sensor 131 is disposed above the first conveyor 11 opposite to the conveyor belt 111, and the distance between the first inductor 131 and the conveyor belt 111 is within the sensing distance of the first inductor 131, so that the first The sensor 131 can effectively sense the transfer position of the circuit board on the conveyor belt 111. The second sensor 132 is disposed above the second conveyor 12 opposite to the transmission wheel 121, and the distance between the second inductor 132 and the transmission wheel 121 is within the sensing distance of the second inductor 132 to enable the second induction. The device 132 can effectively sense the transfer position of the circuit board on the drive wheel 121.

The first inductor 131 is disposed adjacent to the second inductor 132. The first inductor 131 is disposed above the conveyor belt 111 and adjacent to the second conveyor 12 , and the second inductor 132 is disposed above the transmission wheel 121 and adjacent to the first conveyor 11 . Thus, the sensing device 13 can sense two adjacent locations of the circuit boards of the first conveyor 11 and the second conveyor 12, respectively.

The sensing distance between the first sensor 131 and the second sensor 132 may be needed Generally, it should be greater than or equal to the distance between the first conveyor 11 and the second conveyor 12 to facilitate subsequent adjustment of the board spacing. When the distance between the first conveyor 11 and the second conveyor 12 is 15 to 80 mm, the distance between the first inductor 131 and the second inductor 132 is preferably 20 to 120 mm.

The first inductor 131 and the second inductor 132 both have a sensing circuit inside, and each has a signal emitting port and a signal receiving port. The signal transmitting port is used for transmitting the sensing signal, and the signal receiving port is configured to receive the sensing signal reflected by the circuit board and transmitted by the signal board, and the sensing circuit determines the circuit board according to whether the signal receiving port receives the signal emitted by the signal transmitting port. Transfer location. For example, when the circuit board is transferred to the lower side of the first sensor 131, the circuit board will start to reflect the sensing signal emitted by the signal transmitting port, so that the signal receiving port can change from receiving the sensing signal to receiving the sensing signal. Thereby, the sensing circuit of the first sensor 131 can send a message that the board has been sensed and transmitted to the controller 14. The sensing signal can be laser, infrared, ultrasonic or other signals.

The controller 14 has a control circuit 141 and a timing circuit 142 therein. The timing circuit 142 is connected to the first inductor 131 and the second inductor 132 for obtaining the sensing range of the second transmitting device 12 of the two adjacent circuit boards when the circuit board of the second transmitting device 12 leaves the second inductor 132. The time elapsed between the two adjacent circuit boards when the circuit board of the first conveyor 11 enters the sensing range of the first inductor 131. The control circuit 141 is electrically connected to the timing circuit 142, the first inductor 131, and the first driving device 114 for the time obtained by the timing circuit 142, the distance between the first inductor 131 and the second inductor 132, and the Transmission speed control of the second conveyor 12 The conveying speed of the first conveying device 11 is made such that the two adjacent ones are located within a predetermined distance range between the boards of the first conveying device 11 and the second conveying device 12, respectively.

Preferably, the controller 14 can be connected to the sensing device 13 by a signal amplifier to ensure effective transmission of the sensing result of the sensing device 13.

Therefore, the first transfer device 11 and the second transfer device 12 can transfer the circuit board from the first transfer device 11 to the second transfer device 12, and the sensing device 13 can sense two adjacent ones located at the first transfer device 11 and The position of the circuit board of the second transfer device 12, the controller 14 can control the transfer speed of the first transfer device 11 according to the sensing result of the sensing device 13, thereby adjusting the distance between the two boards, that is, the board transfer system 10 can transfer the board and adjust the distance between the transmitted boards.

Referring to FIG. 2, a method for transmitting a circuit board using the board transfer system 10 of the present technical solution includes the following steps:

In the first step, the plurality of boards are transported using the board transport system 10 as above, and the plurality of boards are sequentially transferred from the first conveyor 11 to the second conveyor 12.

At this time, the conveying speed of the first conveying device 11 is the same as the conveying speed of the second conveying device 12, and the conveying speed of the second conveying device 12 is matched with the processing speed of the subsequent processing station.

The circuit board that is first transferred to the second transfer device 12 among any two adjacent circuit boards of the plurality of circuit boards is the nth circuit board 21, and then the circuit board that is transferred to the second transfer device 12 is the nth +1 board 22.

In the second step, the nth circuit board 21 is transferred to the second transmitting device 12, and after entering the sensing range of the second sensor 132, it is separated from the sensing range of the second sensor 132. During this process, the signal receiving port of the second sensor 132 changes from the sensing signal that cannot be received by the signal transmitting port to the sensing signal, and then the sensing signal that can be received from the signal transmitting port. Until the sensor signal can not be received. When the nth circuit board 21 leaves the sensing range of the second sensor 132, the second sensor 132 transmits the message of the nth circuit board 21 away from the second sensor 132 to the controller 14, so that the controller 14 Timing circuit 142 begins timing.

At this time, the n+1th circuit board 22 is still transmitted on the first transfer device 11 and does not enter the sensing range of the first sensor 131.

In the third step, the n+1th circuit board 22 is transferred by the first transfer device 11 and enters the sensing range of the first sensor 131. During this process, the signal receiving port of the first sensor 131 changes from the sensing signal that cannot be received by the signal transmitting port to receive the sensing signal. When the n+1th circuit board 22 enters the sensing range of the first sensor 131, the first sensor 131 transmits the message of the n+1th circuit board 22 to the sensing range of the first sensor 131 to the control. The timer 14 is such that the timing circuit 142 of the controller 14 stops counting.

At this time, the nth circuit board 21 has been transferred on the second transfer device 12 for a certain time.

In the fourth step, the timing circuit 142 of the controller 14 acquires the sensing range from the nth circuit board 21 away from the second inductor 132 to the first sensor 131 to sense the n+1th circuit board 22 to enter the first sensor 131. The time elapsed between the sensing ranges, the control circuit 141 according to the time, the first sensor 131 and the The distance between the two inductors 132 and the transmission speed of the second conveyor 12 obtains the distance between the nth circuit board and the n+1th board, and controls the transmission speed of the first conveyor 11 according to the distance, thereby This distance is adjusted to a predetermined interval.

Specifically, the time period from the sensing range of the nth circuit board 21 to the second sensor 132 is T, and the distance between the signal emitting port of the first sensor 131 and the signal emitting port of the second sensor 132 is D, The transmission speed of the second transmission device 12 is V2, the transmission speed of the first transmission device 11 is V1, and V1 is equal to V2, then the distance between the nth circuit board 21 and the n+1th circuit board 22 is S=V2× T+D. If S is greater than a predetermined distance C between the nth circuit board 21 and the n+1th circuit board 22, the controller 14 should appropriately increase the transmission speed V1 of the first transfer device 11 so that the n+1th circuit board The transfer speed of 22 is greater than the transfer speed of the nth circuit board 21. It is assumed that the transmission speed change value of the first transmission device 11 is ΔV1, that is, the changed transmission speed of the n+1th circuit board 22 by the first transmission device 11 is changed to V1′=V1+ΔV1, and the first transmission device 11 is provided. The n+1th circuit board 22 ΔT' time is transmitted at the transmission speed V1'. At this time, the distance S' between the nth circuit board 21 and the n+1th circuit board 22 can be obtained by the following formula: '=(V2×T)+D(△V1×△T') (1)

Let S'=C, the controller 14 controls the first transfer device 11 to transmit ΔT' time at V1', so that the distance between the nth circuit board 21 and the n+1th circuit board 22 is a predetermined pitch C. Generally, the worker can set ΔV1 or ΔT' to a certain value in advance as needed. For example, ΔT' can be preset to 2 seconds, 5 seconds or other values, and the control circuit of the controller 14 can calculate the specific value of ΔV1 according to the formula (1), and control the first transmission system 11 The n+1th circuit board 22 ΔT' time is transmitted at V1' such that the distance between the nth circuit board 21 and the (n+1)th circuit board 22 is a predetermined pitch C.

If the first sensor 131 senses that the n+1th circuit board 22 enters the sensing range of the first inductor 131, the distance S between the nth circuit board 21 and the n+1th circuit board 22 is equal to the predetermined spacing C, Then, the controller 14 should maintain the transmission speed V1 of the first transmitting device 11 unchanged.

If the first sensor 131 senses that the n+1th circuit board 22 enters the sensing range of the first inductor 131, the distance S between the nth circuit board 21 and the n+1th circuit board 22 is smaller than the nth circuit. The predetermined distance C between the board 21 and the n+1th circuit board 22, the controller 14 should appropriately reduce the transmission speed V1 of the first transfer device 11 so that the transmission speed of the n+1th circuit board 22 is smaller than the nth. The transfer speed of the board 21. It is assumed that the transmission speed change value of the first transport device 11 is ΔV1, that is, the changed first transport device 11 transmits the transport speed V1′=V1ΔV1 of the n+1th circuit board 22, and the first transport device 11 is provided. The n+1th circuit board 22 ΔT' time is transmitted at the transmission speed V1'. At this time, the distance S' between the nth circuit board 21 and the n+1th circuit board 22 can be obtained by the following formula: '=(V2×T)+D+(△V1×△T') (2)

Let S'=C, the controller 14 controls the first transfer device 11 to transmit ΔT' time at V1', so that the distance between the nth circuit board 21 and the n+1th circuit board 22 is a predetermined pitch C.

Of course, in actual operation, the predetermined pitch C generally allows a certain error, that is, the predetermined pitch C is within a certain range. Generally, the predetermined spacing can be between 5 and 10 cm, with an allowable error of between 0.5 and 1 cm.

After the controller 14 adjusts the transfer speed of the first transfer device 11 and makes the distance between the nth circuit board 21 and the n+1th circuit board 22 a predetermined interval, the controller 14 can control the transfer of the first transfer device 11. The speed V1' is returned to the transmission speed V1 before the adjustment, so that the distance between the nth circuit board 21 and the (n+1)th circuit board 22 is maintained at a predetermined interval. Of course, after the n+1th circuit board 22 is completely transferred from the first transfer device 11 to the second transfer device 12, the nth circuit board 21 and the n+1th circuit board 22 can be used by the second transfer device. 12 is smoothly transmitted, and the distance between the nth circuit board 21 and the (n+1)th circuit board 22 is also stably maintained at a predetermined pitch.

In summary, the circuit board transmission system in the technical solution includes an sensing device and a controller, and the controller can control the transmission speed of the first transmitting device by using the acquired time and the sensing result of the first sensor and the second sensor. Thereby, the distance between the adjacent nth circuit board and the n+1th circuit board is adjusted, so that the distance between the two circuit boards is within a predetermined pitch range. The circuit board transmission method of the technical solution can prevent the distance between the circuit boards from being too small or too large, thereby facilitating the subsequent processes.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧Board Transfer System

11‧‧‧First conveyor

12‧‧‧Second conveyor

13‧‧‧Induction device

14‧‧‧ Controller

111‧‧‧Conveyor belt

112‧‧‧First driving wheel

113‧‧‧Second driving wheel

114‧‧‧First drive

121‧‧‧Drive wheel

122‧‧‧Second drive

123‧‧‧Belt

131‧‧‧First sensor

132‧‧‧Second sensor

141‧‧‧Control circuit

142‧‧‧Timekeeping Circuit

21‧‧‧nth circuit board

22‧‧‧n+1th board

FIG. 1 is a schematic diagram of a circuit board transmission system provided by an embodiment of the present technical solution.

2 is a circuit board transmission system transmission circuit provided by an embodiment of the present technical solution Schematic diagram of the board.

10‧‧‧Board Transfer System

11‧‧‧First conveyor

12‧‧‧Second conveyor

13‧‧‧Induction device

14‧‧‧ Controller

111‧‧‧Conveyor belt

112‧‧‧First driving wheel

113‧‧‧Second driving wheel

114‧‧‧First drive

121‧‧‧Drive wheel

122‧‧‧Second drive

123‧‧‧Belt

131‧‧‧First sensor

132‧‧‧Second sensor

141‧‧‧Control circuit

142‧‧‧Timekeeping Circuit

Claims (8)

A circuit board transport system includes a first transfer device, a second transfer device, an inductive device, and a controller, the first transfer device and the second transfer device being disposed adjacent to each other in a board transfer direction, the inductive device including an adjacent setting a first inductor and a second inductor, the first inductor being disposed above the first conveyor and adjacent to the second conveyor, the second inductor being disposed above the second conveyor and adjacent to the first conveyor, the sensing device For sensing two adjacent positions of the circuit boards respectively located at the first transmitting device and the second transmitting device, the controller having a timing circuit and a control circuit, the timing circuit and the first sensor, the second sensing Connected to obtain the first transfer device in the two adjacent circuit boards when the circuit board of the second transfer device in the two adjacent circuit boards is separated from the sensing range of the second sensor The time elapsed between when the circuit board enters the sensing range of the first inductor, and the control circuit is electrically connected to the timing circuit, the first inductor, and the first driving device , For adjusting the conveying speed of the first conveying means according to the distance between the obtained time of the timer circuit, the first inductor and the second inductor and the conveying speed of the second conveying means. The circuit board transport system of claim 1, wherein the first transporting device comprises a first driving wheel, a second driving wheel, a conveyor belt, and a first driving device, the conveyor belt connecting the first driving wheel, The second driving wheel and the first driving device are configured to drive the conveyor belt to move and drive the first driving wheel and the second driving wheel to rotate, thereby transferring the circuit board placed on the conveyor belt. The circuit board transport system of claim 1, wherein the second transport device comprises a plurality of transmissions arranged in sequence along the transmission direction of the circuit board. And a wheel and at least one second driving device for driving the plurality of transmission wheels to rotate, thereby transmitting the circuit board placed on the plurality of transmission wheels. The circuit board transport system of claim 1, wherein the distance between the first sensor and the second sensor is greater than or equal to the distance between the first conveyor and the second conveyor. A circuit board transfer method comprising the steps of: providing a circuit board transfer system according to any one of claims 1 to 4, and a plurality of circuit boards, wherein the plurality of circuit boards are sequentially transferred from the first transfer device to the second transfer device, The circuit board that is first transferred to the second transfer device among the two adjacent circuit boards of the plurality of circuit boards is the nth circuit board, and the circuit board that is later transferred to the second transfer device is the n+1th circuit a second sensor causes the controller to start timing when the nth circuit board leaves the sensing range of the second sensor; when the first sensor senses that the n+1th circuit board enters the sensing range of the first sensor The first sensor causes the controller to stop timing; the controller detects that the nth circuit board enters the sensing range of the first sensor according to the sensing range of the nth circuit board leaving the second sensor to the first sensor The time between the first sensor and the second inductor and the transmission speed of the second conveyor obtain the distance between the nth circuit board and the n+1th board, thereby controlling the transmission speed of the first conveyor. This room Adjusted to a predetermined pitch. The circuit board transfer method of claim 5, wherein the initial transfer speed of the nth circuit board is the same as the initial transfer speed of the n+1th circuit board. The method of transmitting a circuit board according to claim 5, wherein a distance between the nth circuit board and the n+1th circuit board is greater than the nth circuit board The controller increases the transfer speed of the first transfer device when the predetermined interval is the n+1th circuit board; the distance between the nth circuit board and the n+1th circuit board is equal to the nth circuit board and the The controller maintains the transfer speed of the first transfer device at a predetermined interval of n+1 boards; the distance between the nth circuit board and the n+1th circuit board is smaller than the nth circuit board and the nth The controller reduces the transfer speed of the first transfer device when the predetermined pitch of the circuit boards is +1. The method of transmitting a circuit board according to claim 7, wherein the controller adjusts the transmission speed of the first transmitting device after adjusting the distance between the nth circuit board and the (n+1)th circuit board to a predetermined interval. The initial transfer speed is returned to maintain a predetermined distance between the nth circuit board and the n+1th circuit board.