Dispensing and collapsing prevention system

Abstract

A dispensing thread collapse prevention system includes: a continuity detection circuit, a solid-state relay, an intermediate relay, and an alarm device. The continuity detection circuit has a first end coupled to the dispensing valve body needle, a second end coupled to the lead frame, and an output end coupled to the solid-state relay. When the dispensing valve body needle contacts the lead frame, the continuity detection circuit is activated and outputs a continuity signal. The solid-state relay has its output end coupled to the input end of the intermediate relay, and in response to receiving the continuity signal, generates and outputs a trigger signal. The intermediate relay has its output end coupled to the alarm device, and in response to receiving the trigger signal, generates and outputs an alarm signal. The alarm device, in response to receiving the alarm signal, executes an alarm operation. This solution improves the efficiency and accuracy of thread collapse detection and can promptly detect thread collapse and provide timely alerts.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor device manufacturing technology, and in particular to a dispensing filament collapse prevention system. Background Technology

[0002] In some semiconductor device manufacturing processes, semiconductor devices need to be bonded to lead frames using adhesive dispensing. During dispensing, the dispensing valve needle is typically adjusted to the appropriate position and height manually. However, in practical applications, lead wire collapse may occur.

[0003] Currently, the presence of wire collapse is typically detected through manual machine adjustments and visual inspections. However, existing wire collapse detection methods are inefficient and cannot provide timely alerts when wire collapse occurs. Utility Model Content

[0004] This invention provides a dispensing slack prevention system, which can improve the efficiency and accuracy of slack detection, and can detect the occurrence of slack in a timely manner and promptly remind users when slack occurs.

[0005] In a first aspect, this utility model provides a dispensing thread collapse prevention system, comprising: a continuity detection circuit, a solid-state relay, an intermediate relay, and an alarm device, wherein: the continuity detection circuit has a first end coupled to the dispensing valve body needle, a second end coupled to the lead frame, and an output end coupled to the solid-state relay; when the dispensing valve body needle contacts the lead frame, the continuity detection circuit is activated and outputs a continuity signal; the solid-state relay has an output end coupled to the input end of the intermediate relay, and generates and outputs a trigger signal in response to receiving the continuity signal; the intermediate relay has an output end coupled to the alarm device; in response to receiving the trigger signal, it generates and outputs an alarm signal; the alarm device performs an alarm operation in response to receiving the alarm signal.

[0006] When the dispensing valve body needle comes into direct contact with the lead frame, the continuity detection circuit is activated and outputs a continuity signal. The solid-state relay outputs a trigger signal based on the continuity signal, and the intermediate relay outputs an alarm signal to the alarm device based on the trigger signal. Therefore, when direct contact between the dispensing valve body needle and the lead frame is detected, an alarm signal is output to alert the operator of a lead collapse. This improves the efficiency and accuracy of lead collapse detection and provides timely warnings of lead collapse.

[0007] Optionally, the continuity detection circuit includes: a DC power supply, wherein: the positive terminal of the DC power supply is coupled to the dispensing valve body needle; and the solid-state relay, wherein its first input control terminal is coupled to the lead frame, and its second input control terminal is coupled to the negative terminal of the DC power supply.

[0008] Optionally, the voltage of the DC power supply is 3V~5V.

[0009] Optionally, the solid-state relay, in response to receiving the conduction signal, outputs a trigger signal of 220V AC.

[0010] Optionally, the continuity detection circuit includes a control circuit and a detection circuit, wherein: the control circuit has a first end coupled to the dispensing valve body needle and a second end coupled to the detection circuit; the detection circuit is electrically connected to the lead frame; when the dispensing valve body needle contacts the lead frame, the continuity detection circuit is activated, and the control circuit outputs the activation signal.

[0011] Optionally, the dispensing failure prevention system further includes: a reset switch coupled to the intermediate relay; in response to detecting a reset operation, resetting the intermediate relay; and stopping the output of the alarm signal after the intermediate relay is reset.

[0012] Optionally, the dispensing failure prevention system further includes: a switching circuit coupled between the output terminal of the solid-state relay and the input terminal of the intermediate relay, which, in response to receiving a disconnection command, disconnects the connection path between the solid-state relay and the intermediate relay to reset the intermediate relay.

[0013] Optionally, the intermediate relay continues to output the alarm signal after receiving the trigger signal and before being reset.

[0014] Optionally, the alarm device includes at least one of the following: an audible alarm device adapted to output an alarm tone; and a photoelectric alarm device adapted to output an alarm light.

[0015] Optionally, the audible alarm device includes a buzzer or a speaker; the photoelectric alarm device includes an indicator light adapted to output flashing light. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a dispensing slack prevention system according to an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of another dispensing filament collapse prevention system in an embodiment of this utility model;

[0018] Figure 3 This is a structural schematic diagram of another dispensing filament collapse prevention system in this utility model embodiment;

[0019] Figure 4 This is a structural schematic diagram of another dispensing slack prevention system in this utility model embodiment;

[0020] Figure 5 This is a structural schematic diagram of another dispensing filament collapse prevention system in an embodiment of this utility model. Detailed Implementation

[0021] Currently, in addition to manually adjusting the machine and visually inspecting to detect whether there is wire collapse, there are other methods for detecting whether there is wire collapse.

[0022] One method for detecting wire collapse is based on visual recognition. It uses a high-definition industrial camera to photograph the dispensing area and combines this with machine recognition algorithms to identify the relative position of the dispensing valve needle and the gold wire on the lead frame, thus obtaining the distance between the dispensing valve needle and the gold wire. An alarm is triggered when the distance between them is less than a preset threshold. However, this method is significantly affected by the color of the dispensing adhesive and ambient lighting, which can easily affect the recognition accuracy. It also has high equipment costs and a slow response time.

[0023] Another method for detecting wire collapse is based on capacitance changes. The dispensing valve needle and the gold wire on the lead frame are used as the two terminals of a capacitor. By detecting the capacitance between the dispensing valve needle and the gold wire, it is determined whether the distance between them exceeds a set value. However, this method is easily affected by factors such as environmental humidity and the dielectric constant of the adhesive, resulting in a high false alarm rate. It also has poor adaptability to dynamic offsets caused by deformation of the lead frame's base island or unevenness in the base plate, requiring frequent calibration.

[0024] Another method for detecting wire collapse is based on mechanical limiting. This involves setting mechanical blocks along the movement trajectory of the dispensing valve body needle to restrict its lowest position, thus preventing contact between the needle and the gold wire. However, this method cannot adapt to lead frames / base islands of varying thicknesses and lacks compensation for base island deformation or unevenness in the base plate. This can lead to situations where the dispensing valve body needle makes accidental contact with the gold wire due to individual workpiece differences.

[0025] In summary, existing wire collapse detection methods are inefficient and inaccurate. Furthermore, they fail to promptly alert operators when wire collapse occurs.

[0026] In this embodiment of the invention, when the dispensing valve body needle comes into direct contact with the lead frame, the continuity detection circuit is activated and outputs a continuity signal. The solid-state relay outputs a trigger signal based on the continuity signal, and the intermediate relay outputs an alarm signal to the alarm device based on the trigger signal. Therefore, when direct contact between the dispensing valve body needle and the lead frame is detected, an alarm signal is output to alert the operator of a wire collapse. This improves the efficiency and accuracy of wire collapse detection and provides timely alerts.

[0027] To make the above-mentioned objectives, features and beneficial effects of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0028] This utility model embodiment provides a dispensing filament collapse prevention system, refer to... Figure 1 .

[0029] In this embodiment of the invention, the dispensing failure prevention system may include: a continuity detection circuit 101, a solid-state relay 102, an intermediate relay 103, and an alarm device 104, wherein:

[0030] The first end of the continuity detection circuit 101 is coupled to the dispensing valve body needle 20, the second end of the continuity detection circuit 101 is coupled to the lead frame 30, and the output end of the continuity detection circuit 101 is coupled to the solid-state relay 102; when the dispensing valve body needle 20 contacts the lead frame 30, the continuity detection circuit 101 outputs a continuity signal.

[0031] The output terminal of the solid-state relay 102 is coupled to the input terminal of the intermediate relay 103. After receiving the conduction signal, the solid-state relay 102 generates a trigger signal and outputs the trigger signal to the intermediate relay 103.

[0032] The output terminal of the intermediate relay 103 is coupled to the alarm device 104. After receiving the trigger signal, the intermediate relay 103 generates an alarm signal and outputs the alarm signal to the alarm device 104.

[0033] When alarm device 104 receives an alarm signal, it executes an alarm operation.

[0034] In this embodiment of the invention, the continuity detection circuit 101 can detect whether the dispensing valve body needle 20 is in direct contact with the gold wire on the lead frame 30. When the dispensing valve body needle 20 is in direct contact with the gold wire on the lead frame 30, the dispensing valve body needle 20 and the gold wire on the lead frame 30 form a circuit, and the continuity detection circuit 101 outputs a continuity signal.

[0035] In practical applications, it is known that during the dispensing process, the dispensing valve needle 20 can be positioned above the lead frame 30. During normal dispensing, the adhesive extruded from the dispensing valve needle 20 coats the gold wires of the lead frame 30, and there is insulating adhesive between the dispensing valve needle 20 and the lead frame 30, preventing the formation of a conductive path. However, when the dispensing valve needle 20 fails to extrude adhesive properly, or due to factors such as base island deformation or substrate deformation, the dispensing valve needle 20 may come into direct contact with the gold wires of the lead frame 30, thus creating a conductive path between them.

[0036] In other words, when the dispensing valve body needle 20 and the gold wire of the lead frame 30 are not in direct contact, they are electrically isolated and the continuity detection circuit 101 detects that no path is formed between them; when the dispensing valve body needle 20 and the gold wire of the lead frame 30 are in direct contact, the continuity detection circuit 101 detects that a path is formed between them.

[0037] In other words, if direct contact is detected between the dispensing valve body needle 20 and the gold wire of the lead frame 30, a wire collapse can be identified. In other words, when the continuity detection circuit 101 outputs a continuity signal, it indicates a wire collapse. Conversely, when there is no direct contact between the dispensing valve body needle 20 and the lead frame 30, it indicates that no wire collapse has occurred.

[0038] In a specific implementation, the continuity detection circuit 101 may include a DC power supply 1011, as shown in the reference. Figure 2 The present invention provides a structural schematic diagram of another dispensing filament collapse prevention system in an embodiment of the present invention.

[0039] like Figure 2 As shown, the positive (+) terminal of the DC power supply 1011 can be coupled to the dispensing valve body needle 20, and the negative (-) terminal of the DC power supply 1011 can be coupled to the second input control terminal of the solid-state relay 102. Correspondingly, the first input control terminal of the solid-state relay 102 is coupled to the lead frame 30.

[0040] In practical implementation, the aforementioned DC power supply 1011 can be a low-voltage DC power supply. By setting a low-voltage DC power supply, secondary damage to semiconductor devices and gold wires on the lead frame 30 caused by high voltage can be avoided. Furthermore, the output voltage of the low-voltage DC power supply is lower than the safe voltage that a human body can come into contact with, so there is no risk of electric shock when operators come into contact with the lead frame 30 or the dispensing valve needle 20, thus meeting the safety specifications of the production line.

[0041] In practice, the voltage of the DC power supply 1011 can be 3V to 5V.

[0042] In some embodiments, the voltage of the DC power supply is set to 5V.

[0043] When the dispensing valve body needle 20 is working normally, the dispensing valve body needle 20 is coupled to the positive terminal of the DC power supply 1011, and the lead frame 30 is coupled to the first input control terminal of the solid-state relay 102. The two are physically isolated (equivalent to...). Figure 2 Since the switch S1 is in the open state, there is no conducting circuit. The continuity detection circuit 101 does not detect direct contact between the dispensing valve body needle 20 and the lead frame 30, so it will not output a continuity signal.

[0044] When the dispensing valve body needle 20 is in direct contact with the lead frame 30 (equivalent to...) Figure 2When the switch S1 is turned on, a circuit is formed between the positive terminal of the DC power supply 1011, the dispensing valve body needle 20, the lead frame 30, the solid-state relay 102, and the negative terminal of the DC power supply 1011, triggering the solid-state relay 102 to generate a trigger signal. This trigger signal indicates that the dispensing valve body needle 20 is in direct contact with the lead frame 30.

[0045] It should be noted that, Figure 2 The switch S1 in the diagram is only used to illustrate the connection relationship between the dispensing valve body needle 20 and the lead frame 30. In actual circuits, switch S1 may not exist. When the dispensing valve body needle 20 and the lead frame 30 are not in direct contact, it is characterized by switch S1 being in the open state; when the two are in direct contact, it is characterized by switch S1 being in the closed state.

[0046] In a specific implementation, the continuity detection circuit 101 may include a control circuit and a detection circuit. (Refer to...) Figure 3 The present invention provides a structural schematic diagram of another dispensing filament collapse prevention system in an embodiment of the present invention.

[0047] In a specific implementation, the first end of the control circuit 1012 is coupled to the dispensing valve body needle 20, and the second end of the control circuit 1012 is coupled to the detection circuit 1013.

[0048] The detection circuit 1013 is electrically connected to the lead frame 30, that is, the detection circuit 1013 is electrically connected to the gold wire of the lead frame 30; when the dispensing valve body needle 20 is in direct contact with the lead frame 30, the control circuit 1012 outputs a conduction signal.

[0049] Both the control circuit 1012 and the detection circuit 1013 described above can operate in a low-voltage environment. The low-voltage environment refers to an operating environment with a voltage lower than the safe voltage that a human body can access.

[0050] In this embodiment of the invention, the solid-state relay 102 can output a high-voltage trigger signal after receiving a conduction signal. By outputting the high-voltage trigger signal, the subsequent alarm device 104 is driven.

[0051] In a specific implementation, after receiving a conduction signal, the solid state relay 102 (SSR) can output a 220V AC signal as a trigger signal, and output the AC signal to the intermediate relay 103.

[0052] Taking the DC power supply 1011 with a voltage of 5V as an example, the solid-state relay 102 converts the "5V conduction signal" into a "220V AC trigger signal". Subsequent intermediate relays 103, alarm devices 104, etc., can all operate in the 220V voltage range.

[0053] In practical applications, a solid-state relay 102 with a faster response speed can be selected to ensure that when a wire collapse occurs, the signal conversion (conduction signal is converted into the corresponding trigger signal) and transmission (the trigger signal is transmitted to the intermediate relay 103 and alarm device 104 in the subsequent stage) are completed in a very short time, thereby realizing timely alarm.

[0054] In this embodiment of the invention, after receiving a trigger signal, the intermediate relay 103 can continuously output an alarm signal until it is reset and stops outputting the alarm signal. That is, after receiving a trigger signal, the intermediate relay 103 continuously outputs an alarm signal until it is reset.

[0055] Reference Figure 4 The present invention provides a structural schematic diagram of another dispensing filament collapse prevention system in an embodiment of the present invention.

[0056] In practical implementation, the dispensing failure prevention system may also include a reset switch 105, which can be coupled to an intermediate relay 103. When the reset switch 105 detects a reset operation, it can reset the intermediate relay 103. After the intermediate relay 103 is reset, it stops outputting alarm signals.

[0057] In practical applications, after the alarm device 104 alerts to a wire collapse, the operator can manually handle the situation. After handling the wire collapse, the operator can manually reset the reset switch 105.

[0058] Alternatively, an additional controller 107 can be provided. The controller 107 can be coupled to the control terminal of the reset switch 105, and the controller 107 can detect the duration of the alarm operation performed by the alarm device 104. When the controller 107 detects that the duration of the alarm operation performed by the alarm device 104 has reached a preset first duration, the controller 107 can output a reset command to control the reset switch 105 to reset the intermediate relay 103.

[0059] In practice, the value of the first duration can be set based on the specific application scenario, so as to effectively remind the operator.

[0060] In some embodiments, the first duration may be set to 2 minutes. In other embodiments, the first duration is set to 5 minutes. It is understood that the first duration may also take other values.

[0061] Reference Figure 5 The present invention provides a structural schematic diagram of another dispensing filament collapse prevention system in an embodiment of the present invention.

[0062] In a specific implementation, the glue dispensing failure prevention system may also include a switching circuit 106, which can be coupled between the output terminal of the solid-state relay 102 and the input terminal of the intermediate relay 103. When the switching circuit 106 receives a disconnect command, it can disconnect the connection between the solid-state relay 102 and the intermediate relay 103, thereby resetting the intermediate relay 103.

[0063] As described above, in specific applications, the operator can manually operate the switch circuit 106 to input a disconnect command to disconnect the switch circuit 106.

[0064] Alternatively, a controller 107 can be additionally provided. The controller 107 can be coupled to the control terminal of the switching circuit 106, and the controller 107 can detect the duration of the alarm operation performed by the alarm device 104. When the controller 107 detects that the duration of the alarm operation performed by the alarm device 104 has reached a preset first duration, the controller 107 can output a disconnect command to control the switching circuit 106 to disconnect the connection path between the solid-state relay 102 and the intermediate relay 103.

[0065] In some embodiments, the intermediate relay 103 may include a normally open contact. When the intermediate relay 103 receives a trigger signal, the normally open contact closes. When the intermediate relay 103 is reset, the normally open contact opens.

[0066] In a specific implementation, the alarm device 104 can be powered by the solid-state relay 102 via the intermediate relay 103. When the intermediate relay 103 is reset, the connection between the solid-state relay 102 and the alarm device 104 is broken, thereby causing the alarm device 104 to stop performing alarm operations.

[0067] In specific implementations, the alarm device 104 may include any one or two of the following: an audible alarm device and a photoelectric alarm device. When the alarm device 104 is an audible alarm device, the alarm operation performed by the alarm device 104 may be to output an alarm prompt sound; when the alarm device 104 is a photoelectric alarm device, the alarm operation performed by the alarm device 104 may be to output an alarm prompt light.

[0068] In some embodiments, the audible alarm device can be a buzzer, which can emit a buzzing sound to alert the operator when an alarm signal is received. The photoelectric alarm device 104 can be an indicator light, which can emit flashing light to alert the operator when an alarm signal is received.

[0069] In another embodiment, the audible alarm device can be a speaker that can output information such as "a wire has collapsed, please be careful" to alert the operator.

[0070] It is understood that the alarm device 104 may also include other types of electronic devices or components capable of performing alarm operations, which, upon receiving an alarm signal, can perform alarm operations to alert the operator of a wire collapse. In this embodiment of the invention, the specific type of the alarm device 104 is not limited.

[0071] In summary, the dispensing thread collapse prevention system provided in this embodiment of the invention activates the continuity detection circuit and outputs a continuity signal when the dispensing valve body needle directly contacts the lead frame. The solid-state relay outputs a trigger signal based on the continuity signal, and the intermediate relay outputs an alarm signal to the alarm device based on the trigger signal. Therefore, when direct contact between the dispensing valve body needle and the lead frame is detected, an alarm signal is output to alert the operator of thread collapse. This improves the efficiency and accuracy of thread collapse detection and provides timely alerts.

[0072] Furthermore, when the dispensing valve body needle is dispensing glue normally, due to the insulating nature of the glue, the dispensing valve body needle will not directly contact the lead frame, so the continuity detection circuit will not output a continuity signal, thus avoiding the possibility of false alarms.

[0073] In cases where the base island of the lead frame is deformed or the base plate is uneven, causing the dispensing valve needle to come into direct contact with the lead frame, the alarm device 104 will also be triggered to perform an alarm operation, thus covering all scenarios where wire collapse occurs due to equipment malfunction.

[0074] In summary, the dispensing thread collapse prevention system provided by this utility model embodiment can realize a closed-loop process of "direct contact between the dispensing valve body needle and the lead frame" → "alarm prompt" → "operator intervention", and achieve real-time monitoring of thread collapse detection.

[0075] Although the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A dispensing slack prevention system, characterized in that, include: The continuity detection circuit includes a solid-state relay, an intermediate relay, and an alarm device, among which: The continuity detection circuit has a first end coupled to the dispensing valve body needle, a second end coupled to the lead frame, and an output end coupled to the solid-state relay; when the dispensing valve body needle contacts the lead frame, the continuity detection circuit is turned on and outputs a continuity signal. The solid-state relay has its output terminal coupled to the input terminal of the intermediate relay, and generates and outputs a trigger signal in response to receiving the conduction signal; The intermediate relay has its output terminal coupled to the alarm device; in response to receiving the trigger signal, it generates and outputs an alarm signal. The alarm device performs an alarm operation in response to receiving the alarm signal.

2. The dispensing slack prevention system as described in claim 1, characterized in that, The continuity detection circuit includes: a DC power supply, wherein: The positive terminal of the DC power supply is coupled to the dispensing valve body needle. The solid-state relay has a first input control terminal coupled to the lead frame and a second input control terminal coupled to the negative terminal of the DC power supply.

3. The dispensing slack prevention system as described in claim 2, characterized in that, The voltage of the DC power supply is 3V~5V.

4. The dispensing slack prevention system as described in claim 1, characterized in that, The solid-state relay, in response to receiving the conduction signal, outputs a trigger signal of 220V AC.

5. The dispensing slack prevention system as described in claim 1, characterized in that, The continuity detection circuit includes a control circuit and a detection circuit, wherein: The control circuit has a first end coupled to the dispensing valve body needle and a second end coupled to the detection circuit. The detection circuit is electrically connected to the lead frame; when the dispensing valve body needle contacts the lead frame, the control circuit outputs the conduction signal.

6. The dispensing slack prevention system as described in claim 1, characterized in that, Also includes: A reset switch is coupled to the intermediate relay; in response to a detected reset operation, the intermediate relay is reset; after the intermediate relay is reset, it stops outputting the alarm signal.

7. The dispensing slack prevention system as described in claim 1, characterized in that, Also includes: A switching circuit, coupled between the output terminal of the solid-state relay and the input terminal of the intermediate relay, disconnects the connection between the solid-state relay and the intermediate relay in response to a disconnect command, thereby resetting the intermediate relay.

8. The dispensing slippage prevention system as described in claim 6 or 7, characterized in that, The intermediate relay continuously outputs the alarm signal after receiving the trigger signal and before being reset.

9. The dispensing slack prevention system as described in claim 1, characterized in that, The alarm device includes at least one of the following: an audible alarm device adapted to output an alarm tone; and an optical alarm device adapted to output an alarm light.

10. The dispensing slack prevention system as described in claim 9, characterized in that, The audible alarm device includes a buzzer or a speaker; the photoelectric alarm device includes an indicator light adapted to output flashing light.

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