CN117329973A - PCB displacement detection device and method - Google Patents

PCB displacement detection device and method Download PDF

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Publication number
CN117329973A
CN117329973A CN202311191295.0A CN202311191295A CN117329973A CN 117329973 A CN117329973 A CN 117329973A CN 202311191295 A CN202311191295 A CN 202311191295A CN 117329973 A CN117329973 A CN 117329973A
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CN
China
Prior art keywords
light
pcb
sensor
throwing
receiving sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311191295.0A
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Chinese (zh)
Inventor
徐广峰
陈海巍
王菁菁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuxi Ysphotech Semiconductor Technology Co ltd
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Wuxi Ysphotech Semiconductor Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuxi Ysphotech Semiconductor Technology Co ltd filed Critical Wuxi Ysphotech Semiconductor Technology Co ltd
Priority to CN202311191295.0A priority Critical patent/CN117329973A/en
Publication of CN117329973A publication Critical patent/CN117329973A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/20—Exposure; Apparatus therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/70—Microphotolithographic exposure; Apparatus therefor
    • G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
    • G03F7/7085—Detection arrangement, e.g. detectors of apparatus alignment possibly mounted on wafers, exposure dose, photo-cleaning flux, stray light, thermal load
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F9/00—Registration or positioning of originals, masks, frames, photographic sheets or textured or patterned surfaces, e.g. automatically
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Epidemiology (AREA)
  • Public Health (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention relates to a PCB displacement detection device and a method, wherein the device comprises a workbench, a driving mechanism, a transmission mechanism, a light-throwing sensor and a light-receiving sensor; the transmission mechanism is connected with the driving mechanism, the light throwing sensor is connected with the transmission mechanism, and the transmission mechanism can drive the light throwing sensor to rotate; the light receiving sensor is connected with the workbench and is positioned at one side of the PCB; the driving mechanism is driven by the driving mechanism and drives the light throwing sensor to rotate, so that the light throwing sensor rotates to one side of the back of the PCB, which is away from the light receiving sensor, so that the PCB is positioned between the light throwing sensor and the light receiving sensor, the light receiving sensor receives light emitted from the light throwing sensor, and the displacement change of the PCB is detected by detecting the change of the light quantity. The invention can monitor whether the PCB is relatively displaced relative to the bearing surface in the process of making the board in real time, and solves the problem that the upper computer can not acquire the information because the PCB is displaced after the adsorption system or the clamping mechanism is used by the PCB in LDI industry.

Description

PCB displacement detection device and method
Technical Field
The invention relates to the technical field of PCB displacement detection, in particular to a PCB displacement detection device and method.
Background
When an LDI (laser direct imaging, laser direct imaging technology) exposure machine performs exposure operation, mark point alignment is required to be performed first, and then exposure imaging is required to be performed. In the process, relative displacement of the PCB on the sucker is not allowed, namely mark information on the PCB is acquired after alignment, the equipment recognizes the coordinate position of the current PCB relative to the whole machine, and corresponding position data are transmitted to the imaging system to generate image information of the corresponding position. If the moving table drives the PCB to transmit after the image data is generated, the position of the PCB relative to the bearing surface is displaced in the process of the PCB, the corresponding position of the exposed image on the PCB is shifted, and therefore the waste board is caused.
In order to solve the problem that the PCB is relatively displaced in the alignment and exposure transmission processes, the prior art uses an adsorption system or a clamping mechanism to fix the PCB, so that the PCB is ensured not to be relatively displaced relative to the bearing surface in the whole exposure process. However, in the actual use process, the adsorption system or the clamping mechanism still has the situation of displacement of the PCB due to insufficient adsorption force or loose clamping mechanism after use. However, because the adsorption system or the clamping plate mechanism is used, the default PCB cannot be displaced, even if exposure deviation is caused by displacement of the PCB, equipment cannot be identified, error prompt cannot be made, and the problematic PCB can flow into the next process to finally cause waste plates.
Disclosure of Invention
In order to solve the problems, the invention provides the PCB displacement detection device and the PCB displacement detection method, which can monitor whether the PCB is relatively displaced relative to the bearing surface in the process of making the PCB in real time, and solve the problem that the upper computer cannot acquire the information because the PCB displacement still exists after the adsorption system or the clamping mechanism is used by the PCB in the LDI industry.
Specifically, the method comprises the following technical scheme:
in one aspect, the present invention provides a PCB board displacement detection apparatus, including:
the workbench is used for bearing the PCB;
the driving mechanism is connected with the workbench;
a transmission mechanism coupled to the drive mechanism, the transmission mechanism configured to receive power from the drive mechanism and rotate;
the light throwing sensor is connected with the transmission mechanism, and the transmission mechanism can drive the light throwing sensor to rotate; and
the light receiving sensor is connected with the workbench and is positioned at one side of the PCB;
the driving mechanism is driven by the driving mechanism and drives the light throwing sensor to rotate, so that the light throwing sensor rotates to one side of the PCB, which is away from the light receiving sensor, so that the PCB is positioned between the light throwing sensor and the light receiving sensor, the light receiving sensor receives light emitted from the light throwing sensor, and the change of the displacement of the PCB is detected by detecting the change of the light quantity received by the light receiving sensor.
In some embodiments, the light-casting sensor and the light-receiving sensor are ranging sensors.
In some embodiments, a notch is disposed on one side of the workbench, and the notch is located between the light-throwing sensor and the light-receiving sensor, so that light emitted by the light-throwing sensor can penetrate through the notch and enter the light-receiving sensor.
In some embodiments, barrier strips are arranged on two sides of the workbench, scale bars are arranged on the barrier strips, and the barrier strips are used for measuring the size of the PCB and limiting the PCB.
In some embodiments, the device further comprises a fixing plate fixedly connected to one side of the workbench, and the driving mechanism and the conveying mechanism are arranged on the fixing plate.
In some embodiments, the drive mechanism comprises a motor, a cylinder.
In some embodiments, the transmission mechanism comprises a first belt pulley, a second belt pulley and a conveyor belt, wherein the first belt pulley is connected with the second belt pulley through the conveyor belt, the first belt pulley is connected with the driving mechanism, the second belt pulley is connected with a rotating shaft, one end, far away from the second belt pulley, of the rotating shaft is connected with a fixing piece, and the light throwing sensor is fixedly connected with the fixing piece.
On the other hand, the invention provides a PCB displacement detection method, which adopts the PCB displacement detection device and comprises the following steps:
step one, a driving mechanism drives a light throwing sensor to rotate through a transmission mechanism, so that the PCB is placed on a workbench after the light throwing sensor is in a vertical state;
step two, the driving mechanism drives the light-throwing sensor to rotate through the transmission mechanism, so that the light-throwing sensor is in a horizontal state, the light-throwing sensor and the light-receiving sensor enter a working state after being subjected to light, and the current feedback value a of the light-receiving sensor is recorded;
and thirdly, the workbench drives the PCB to sequentially move to an alignment station and an exposure station of the exposure machine, the feedback value b of the current light receiving sensor is recorded in real time, the value of the absolute value a-b is calculated, and if the absolute value a-b is larger than the set threshold value c, the PCB is forbidden to enter the exposure process.
In some embodiments, in the third step, if the |a-b| is greater than the set threshold c, the exposure process is prohibited from being performed; if a-b is less than or equal to the set threshold c, the exposure process is entered.
In some embodiments, in the third step, after the alignment process and after the exposure process, if |a-b| is greater than the set threshold value c, the PCB is prohibited from entering the next production process; if |a-b| is less than or equal to the set threshold c, then the exposure is complete.
Based on the technical scheme, the PCB displacement caused by insufficient adsorption force or loosening of the clamping mechanism can be detected and error reporting is formed. The problematic PCB board can not flow into the next procedure, and the problems existing in the current adsorption system or clamping mechanism can be fed back so as to be convenient for repairing. In addition, if relative displacement occurs between alignment and imaging, the exposure process can be refused to be entered, and the waste board caused by the current PCB board is avoided. The invention can monitor whether the PCB is relatively displaced relative to the bearing surface in the process of making the board in real time, and solves the problem that the upper computer can not acquire the information because the PCB is displaced after the adsorption system or the clamping mechanism is used by the PCB in LDI industry.
In addition, the invention adopts the driving mechanism and the transmission mechanism to drive the light-throwing sensor to rotate, so that the light-throwing sensor can be switched between a vertical state and a horizontal state. Before the PCB is placed on the workbench, the light-throwing sensor is in a vertical state, so that interference between the mechanical arm or the manual placement of the PCB and the light-throwing sensor can be avoided, and the placement of the PCB is facilitated; after the PCB is placed on the workbench, the driving mechanism drives the PCB to rotate through the transmission mechanism, so that the light-throwing sensor is in a horizontal state, the light-throwing sensor and the light-receiving sensor are in the same vertical plane, the working state is achieved after light is focused, at the moment, the displacement change of the PCB can be measured through the sensor, and the device is simple in structure, convenient to use and accurate in measurement.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a perspective view of a displacement detection device for a PCB board according to the present invention.
Fig. 2 is a plan view of the PCB board displacement detecting apparatus of the present invention when the light sensor is in a vertical state.
Fig. 3 is a plan view of the PCB board displacement detecting apparatus of the present invention when the light sensor is in a horizontal state.
Fig. 4 is a schematic diagram of the sensor of the present invention for measuring displacement of a PCB board.
Fig. 5 is a diagram showing the positional relationship among the light-projecting sensor, the light-receiving sensor and the PCB board when the light-projecting sensor is in a vertical state.
Fig. 6 is a diagram showing the positional relationship among the light-projecting sensor, the light-receiving sensor and the PCB board when the light-projecting sensor is in a horizontal state.
Fig. 7 is a schematic structural view of the driving mechanism and the transmission mechanism of the present invention.
Fig. 8 is a schematic view of the structure of the PCB board of the present invention in an alignment station of an exposure machine.
Fig. 9 is a schematic structural view of the PCB board of the present invention in an exposure station of an exposure machine.
Fig. 10 is a flowchart of a method for detecting displacement of a PCB board according to the present invention.
Reference numerals illustrate: 1. a driving mechanism; 2. a transmission mechanism; 21. a first pulley; 22. a second pulley; 23. a conveyor belt; 24. a rotating shaft; 25. a fixing member; 3. a light sensor is arranged; 4. a light receiving sensor; 5. a PCB board; 6. a barrier strip; 7. a work table; 8. a fixing plate; 9. a notch; 10. and (5) an exposure machine.
Detailed Description
The present invention is described in detail below. In the following paragraphs, the different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless explicitly stated to be non-combinable. In particular, any feature or features may be combined with one or more other features may be desired and advantageous.
The terms "first," "second," and the like in the present invention are merely for convenience of description to distinguish between different constituent components having the same name, and do not denote a sequential or primary or secondary relationship.
In addition, when an element is referred to as being "on" another element, it can be directly on the other element or be indirectly on the other element with one or more intervening elements interposed therebetween. In addition, when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element with one or more intervening elements interposed therebetween. Like reference numerals refer to like elements hereinafter.
The description of the orientation or positional relationship indicated by "upper", "lower", "top", "bottom", "front", "rear", "inner" and "outer", etc. is used in the present invention for convenience of description only, and is not intended to indicate or imply that the apparatus referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the invention.
As shown in fig. 1-7, the present invention provides a PCB board displacement detection apparatus, in some embodiments, comprising:
a workbench 7 for carrying the PCB 5;
a driving mechanism 1 connected to the table 7;
a transmission mechanism 2 connected to the driving mechanism 1, the transmission mechanism 2 being configured to receive power from the driving mechanism 1 and rotate;
the light throwing sensor 3 is connected with the transmission mechanism 2, and the transmission mechanism 2 can drive the light throwing sensor 3 to rotate; and
a light receiving sensor 4 connected to the table 7 and located at one side of the PCB 5;
the transmission mechanism 2 is driven by the driving mechanism 1 and drives the light-throwing sensor 3 to rotate, so that the light-throwing sensor 3 rotates to one side of the PCB 5, which is away from the light-receiving sensor 4, so that the PCB 5 is positioned between the light-throwing sensor 3 and the light-receiving sensor 4, the light-receiving sensor 4 receives light emitted from the light-throwing sensor 3, and the displacement change of the PCB 5 is detected by detecting the change of the light quantity received by the light-receiving sensor 4.
In the embodiment of the invention, the sensor is used for detecting the displacement of the PCB 5, and the displacement change of the PCB 5 can be measured when the light-throwing sensor 3 and the light-receiving sensor 4 are positioned on the same working surface. When the PCB 5 moves relatively, the light quantity sent by the light-throwing sensor 3 to the light-receiving sensor 4 changes, so that the light quantity is converted into the displacement of the PCB 5. Thus, whether the relative displacement of the PCB 5 relative to the bearing surface of the workbench 7 occurs in the board making process can be monitored in real time.
In addition, the driving mechanism 1 and the transmission mechanism 2 are adopted to drive the light-throwing sensor 3 to rotate, so that the light-throwing sensor 3 can be switched between a vertical state and a horizontal state. Before the PCB 5 is placed on the workbench 7, the light-throwing sensor 3 is in a vertical state, namely, the light-throwing sensor 3 is vertical to the workbench 7, so that interference between the light-throwing sensor 3 and a mechanical arm or manual placement of the PCB can be avoided, and the placement of the PCB is facilitated; when the PCB 5 is placed on the workbench 7, the driving mechanism 1 drives the PCB 5 to rotate through the transmission mechanism 2, so that the light throwing sensor 3 is in a horizontal state, namely, the light throwing sensor 3 is parallel to the workbench 7, the PCB 5 and the light receiving sensor 4, the light throwing sensor 3 and the light receiving sensor 4 are in the same vertical plane, and the light enters into a working state after being focused, and at the moment, the displacement change of the PCB 5 can be measured through the sensor.
Optionally, the light-projecting sensor 3 and the light-receiving sensor 4 are distance measuring sensors, such as laser distance measuring sensors.
Optionally, in some embodiments, a notch 9 is disposed on one side of the table 7, and the notch 9 is located between the light-casting sensor 3 and the light-receiving sensor 4, so that the light emitted by the light-casting sensor 3 can penetrate through the notch 9 and enter the light-receiving sensor 4.
Optionally, in some embodiments, barrier strips 6 are disposed on two sides of the workbench 7, a scale is disposed on the barrier strips 6, and the barrier strips 6 are used for measuring the size of the PCB 5 and limiting the PCB 5. When the PCB is placed, the PCB 5 is abutted against the barrier strips 6 on two sides of the workbench 7.
Optionally, in some embodiments, the apparatus further includes a fixing plate 8, the fixing plate 8 is fixedly connected to one side of the table 7, and the driving mechanism 1 and the conveying mechanism 2 are disposed on the fixing plate 8.
Alternatively, in some embodiments, the drive mechanism 1 includes, but is not limited to, a motor, a cylinder, and the like.
Optionally, the transmission mechanism 2 includes a first belt pulley 21, a second belt pulley 22 and a conveyor belt 23, the first belt pulley 21 is connected with the second belt pulley 22 through the conveyor belt 23, the first belt pulley 21 is connected with the driving mechanism 1, the second belt pulley 22 is connected with a rotating shaft 24, one end of the rotating shaft 24 away from the second belt pulley 22 is connected with a fixing piece 25, and the light-throwing sensor 3 is fixedly connected with the fixing piece 25.
The driving mechanism 1 drives the first belt pulley 21 to rotate, the first belt pulley 21 drives the second belt pulley 22 to rotate through the conveying belt 23, and the second belt pulley 22 drives the fixing piece 25 and the light-throwing sensor 3 connected with the fixing piece 25 to rotate through the rotating shaft 24, so that the light-throwing sensor 3 is switched between a vertical state and a horizontal state.
Finally, as shown in fig. 8-10, the present invention also provides a PCB board displacement detection method, which adopts the PCB board displacement detection apparatus of the above embodiment, and in some embodiments, the method includes the following steps:
step one, a driving mechanism drives a light throwing sensor to rotate through a transmission mechanism, so that the PCB is placed on a workbench after the light throwing sensor is in a vertical state;
step two, the driving mechanism drives the light-throwing sensor to rotate through the transmission mechanism, so that the light-throwing sensor is in a horizontal state, the light-throwing sensor and the light-receiving sensor enter a working state after being subjected to light, and the current feedback value a of the light-receiving sensor is recorded;
and thirdly, the workbench drives the PCB to sequentially move to an alignment station and an exposure station of the exposure machine 10, the feedback value b of the current light receiving sensor is recorded in real time, the value of the absolute value a-b is calculated, and if the absolute value a-b is larger than the set threshold value c, the PCB is forbidden to enter an exposure process.
Wherein in the third step, if |a-b| is greater than the set threshold c, the exposure process is forbidden to be entered, the workbench drives the PCB to exit, and the step three is executed after the PCB is clamped again and adsorbed; if a-b is less than or equal to the set threshold c, the exposure process is entered.
In the third step, after the alignment process and after the exposure process, if the absolute value of a-b is larger than the set threshold value c, recording a problem board, prohibiting the PCB from entering the next production process, and re-manufacturing the board after the back washing; if |a-b| is less than or equal to the set threshold c, then the exposure is complete.
The steps one to three are sequentially executed, and the embodiment can detect the displacement of the PCB caused by insufficient adsorption force or loosening of the clamping mechanism and form error reporting. The problematic PCB board can not flow into the next procedure, and the problems existing in the current adsorption system or clamping mechanism can be fed back so as to be convenient for repairing. In addition, if relative displacement occurs between alignment and imaging, the exposure process can be refused to be entered, and the waste board caused by the current PCB board is avoided. The invention can monitor whether the PCB is relatively displaced relative to the bearing surface in the process of making the board in real time, and solves the problem that the upper computer can not acquire the information because the PCB is displaced after the adsorption system or the clamping mechanism is used by the PCB in LDI industry.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
The principles and embodiments of the present invention have been described herein with reference to specific examples, which are intended to be merely illustrative of the methods of the present invention and their core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. A PCB board displacement detection device, characterized by comprising:
the workbench is used for bearing the PCB;
the driving mechanism is connected with the workbench;
a transmission mechanism coupled to the drive mechanism, the transmission mechanism configured to receive power from the drive mechanism and rotate;
the light throwing sensor is connected with the transmission mechanism, and the transmission mechanism can drive the light throwing sensor to rotate; and
the light receiving sensor is connected with the workbench and is positioned at one side of the PCB;
the driving mechanism is driven by the driving mechanism and drives the light throwing sensor to rotate, so that the light throwing sensor rotates to one side of the PCB, which is away from the light receiving sensor, so that the PCB is positioned between the light throwing sensor and the light receiving sensor, the light receiving sensor receives light emitted from the light throwing sensor, and the change of the displacement of the PCB is detected by detecting the change of the light quantity received by the light receiving sensor.
2. The PCB board displacement detection apparatus of claim 1, wherein the light sensor and the light receiving sensor are distance measuring sensors.
3. The PCB board displacement detection device of claim 1, wherein a notch is provided on one side of the table, the notch being located between the light-receiving sensor and the light-throwing sensor, so that light emitted by the light-throwing sensor can penetrate through the notch and enter the light-receiving sensor.
4. The device for detecting displacement of a PCB according to claim 1, wherein barrier strips are arranged on two sides of the workbench, a graduated scale is arranged on the barrier strips, and the barrier strips are used for measuring the size of the PCB and limiting the PCB.
5. The PCB displacement detection device of claim 1, further comprising a fixing plate fixedly connected to one side of the table, the driving mechanism and the conveying mechanism being disposed on the fixing plate.
6. The PCB displacement detection apparatus of any one of claims 1-5, wherein the driving mechanism comprises a motor, a cylinder.
7. The PCB board displacement detecting apparatus according to any one of claims 1 to 5, wherein the transmission mechanism comprises a first belt pulley, a second belt pulley and a conveyor belt, the first belt pulley is connected with the second belt pulley through the conveyor belt, the first belt pulley is connected with the driving mechanism, the second belt pulley is connected with a rotating shaft, one end of the rotating shaft away from the second belt pulley is connected with a fixing member, and the light-throwing sensor is fixedly connected with the fixing member.
8. A method for detecting displacement of a PCB board, characterized in that the device for detecting displacement of a PCB board according to any one of claims 1 to 7 is used, comprising the steps of:
step one, a driving mechanism drives a light throwing sensor to rotate through a transmission mechanism, so that the PCB is placed on a workbench after the light throwing sensor is in a vertical state;
step two, the driving mechanism drives the light-throwing sensor to rotate through the transmission mechanism, so that the light-throwing sensor is in a horizontal state, the light-throwing sensor and the light-receiving sensor enter a working state after being subjected to light, and the current feedback value a of the light-receiving sensor is recorded;
and thirdly, the workbench drives the PCB to sequentially move to an alignment station and an exposure station of the exposure machine, the feedback value b of the current light receiving sensor is recorded in real time, the value of the absolute value a-b is calculated, and if the absolute value a-b is larger than the set threshold value c, the PCB is forbidden to enter the exposure process.
9. The method for detecting displacement of a PCB according to claim 8, wherein in the third step, if |a-b| is greater than a set threshold c, the exposure process is prohibited from being entered; if a-b is less than or equal to the set threshold c, the exposure process is entered.
10. The method of claim 8, wherein in the third step, after the alignment process and after the exposure process, if |a-b| is greater than a set threshold value c, the PCB is prohibited from entering the next production process; if |a-b| is less than or equal to the set threshold c, then the exposure is complete.
CN202311191295.0A 2023-09-15 2023-09-15 PCB displacement detection device and method Pending CN117329973A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311191295.0A CN117329973A (en) 2023-09-15 2023-09-15 PCB displacement detection device and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311191295.0A CN117329973A (en) 2023-09-15 2023-09-15 PCB displacement detection device and method

Publications (1)

Publication Number Publication Date
CN117329973A true CN117329973A (en) 2024-01-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311191295.0A Pending CN117329973A (en) 2023-09-15 2023-09-15 PCB displacement detection device and method

Country Status (1)

Country Link
CN (1) CN117329973A (en)

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