KR100631368B1 - An inspection device of Stencil and Handling method thereof - Google Patents

Abstract

The stencil checker according to the present invention includes a test table 120 on which a component having a cream coated on a stencil or a pad of a printed circuit board having an opening having the same shape as a pad of a printed circuit board is mounted. Wow; A camera 140 provided at one side of the test table 120 and photographing to confirm a surface state of the stencil or a component; A digital counter 220 provided at one side of the test table 120 to designate and read the position of the test table; It is provided on one side of the digital counter 220, and comprises a computer 240, the contents of the camera 140 and the digital counter 220 is displayed and stored. And the operation method of the stencil tester according to the present invention, the power input step (S10) for turning on (ON) the power switch of the switch box, and the stencil or parts for checking the surface state on the inspection table 120 A setting step (S20) to put up, a test step moving step (S30) for moving the test table 120 to a desired position, and a shooting step (S40) for photographing the surface state of the stencil or parts with the camera 140; It comprises a storage step (S50) for storing the content taken in the shooting step (S40) to the computer 240. According to such a structure, there exists an advantage that a process can be unified and defects can be prevented beforehand.

Stencil Inspector, Stencil, Printed Circuit Board, Inspection Table, Camera, Digital Counter

Description

Stencil tester and its operation method {An inspection device of Stencil and Handling method

1 is a perspective view of a stencil checker according to a preferred embodiment of the present invention.

Figure 2a is a perspective view of a work table which is a main component of the stencil checker according to the present invention.

Figure 2b is a perspective view of the display unit mounting portion of the main configuration of the stencil inspection machine according to the present invention.

3 is a wiring connection diagram of a stencil checker according to a preferred embodiment of the present invention.

4 is a schematic flowchart of a method for operating a stencil checker according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100. ..... Worktable 120. ..... Inspection Table

122. ..... Y-axis handle 124. ..... X-axis handle

140. ..... camera 142. ..... lighting fixtures

160. ..... Power Supply 180. ..... Amplifier

200. ..... Display Mounting Unit 220. ..... Digital Counter

240. ..... Computer 260. ..... Monitor

280. ..... Switch Box P. ..... Power Cord

S10. ..... Power input step S20. ..... Setting Steps

S30. ..... Inspection stage moving step S40. ..... Shooting steps

S50. ..... Save step

The present invention relates to a tester, and more particularly, to a cream of a stencil or a pad of a printed circuit board (PCB) having an opening having the same shape as that of a pad of a printed circuit board (PCB). A stencil inspector for inspecting the surface state of the coated component and a method of operating the same.

In general, surface mounting technology (resistance, capacitor, IC, etc.) is mounted on the surface of a printed circuit board (PCB) and soldered technology is called Surface Mount Technology (SMT), the machine used The device is called a Surface Mounter Device (SMD).

The surface mount technology (SMT) process has a configuration of approximately seven steps.

That is, a loading step of automatically supplying the printed circuit board (PCB) and a screen print applied to the upper pad of the printed circuit board (PCB) by using a solder cream. Step), a buffer step for visually inspecting the state of the previous process, a mount step for mounting a large amount of chips at high speed on a printed circuit board (PCB), and transfer after mounting parts It consists of a buffer step for visually inspecting the printed circuit board (PCB), a reflow step for soldering solder cream, and an unloading step for loading a finished product. .

In the screen printing step, the solder cream is printed through the opening of the stencil using a stencil having an opening having a predetermined shape.

The stencil is usually different according to the material and the lot of the product, but the solder cream is used more than 20,000 times using a metal squeegee or a urethane squeegee.

However, in the prior art, the operator uses the magnifying glass to visually check the state of the foreign matter and the opening of the stencil. Also, since the criteria for determining the stencil vary depending on the operator, it is difficult to accurately determine the wear state of the stencil.

In addition, there is a problem in that it is not possible to manage the data (Data) for the use cycle and the bad judgment of the stencil.

In addition, when the stencil is not properly managed, the opening of the solder cream does not pass smoothly, so that no solder or solder adjacent to the two adjacent solders is contacted, such as a short. There is a problem that a lot of defects occur.

Accordingly, an object of the present invention for solving the above problems, the pad of the stencil (PCB) or the printed circuit board (PCB) having an opening having the same shape as the pad (Pad) of the printed circuit board (PCB). It is to provide a stencil (Stencil) inspector for inspecting the surface state of the parts coated with a sour cream and a method of operating the same.

Stencil (Stencil) tester according to the present invention for achieving the above object, the solder to the pad of the stencil (Stencil) or the printed circuit board having the same shape as the pad (Pad) of the printed circuit board (PCB). An inspection table on which a cream cream coated component is mounted; A camera provided at one side of the inspection table and photographed to check a surface state of the stencil or parts; A digital counter provided at one side of the inspection table to designate and read the position of the inspection table; It is provided on one side of the digital counter, characterized in that it comprises a computer (Computer) is displayed and stored the contents of the camera and the digital counter.

One side of the test stand is characterized in that the Y (Y) axis handle for adjusting the flow of the test stand in the front and rear direction, and the X (X) handle for adjusting the flow of the test stand in the horizontal direction.

One side of the camera is characterized in that the lighting device further illuminates the light so that the camera can recognize the surface state of the stencil or parts.

And the operation method of the stencil (Stencil) tester according to the present invention, the power input step to turn on (ON) the power switch of the switch box (Switch box), and a stencil (Stencil) or parts for checking the surface state on the inspection table A setting step of placing, an examination step moving step of moving the test table to a desired position, a shooting step of photographing the surface state of the stencil or parts with a camera, and a content of the photographing step in the computer (Comouter) characterized in that it is configured to include a storage step for storing.

In the inspection table moving step, the inspection table may be moved back and forth or left and right by using a linear scale.

In the photographing step, the content photographed by the camera is specified and displayed on a digital counter.

According to the present invention having such a configuration, since all the workers check the state of the stencil and the parts by the same equipment and method, there is an advantage that the process can be unified to prevent defects in advance.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the stencil checker and its operation method according to the present invention will be described in detail.

Figure 1 is a perspective view of a stencil checker according to a preferred embodiment of the present invention, Figure 2a is a perspective view of a work table which is a main component of the stencil checker according to the present invention, Figure 2b is a stencil according to the present invention The perspective view of the display mounting part which is a main part of an inspection machine is shown.

3 shows a wiring connection diagram of a stencil checker according to a preferred embodiment of the present invention, and FIG. 4 shows a schematic flowchart of a method of operating a stencil checker according to a preferred embodiment of the present invention.

As shown in these figures, the stencil checker according to the present invention has a stencil (Stencil) through which a solder cream penetrates through a pad of a surface of a printed circuit board (PCB) by forming an opening having a predetermined shape or It is a device to check the surface condition of parts coated with a sour cream on a pad of a printed circuit board (PCB).

The stencil checker includes a work table 100 on which the test table 120 is installed so that the stencil (Stencil, not shown) or parts (not shown) are largely placed, and a digital counter and a computer to be described below. And a display unit mounting table 200 on which a computer or the like is installed.

The inspection table 120 is installed at an approximately center portion of the work table 100. The inspection table 120 is formed as a substantially rectangular plate, and is configured to move in the front and rear or left and right directions using a linear scale having an error of 0.001 mm.

A front Y-axis handle 122 is provided on the front left side of the inspection table 120 to adjust the inspection table 120 to flow in the front-rear direction, and the front right side adjusts the inspection table 120 to flow in the left and right directions. An X (X) axis handle 124 is provided. Therefore, the inspection table 120 is moved little by little in the front and rear or left and right directions on a linear scale by adjusting the Y-axis handle and the X-axis handle.

On the upper side of the inspection table 120 is installed a camera (Camera, 140) to check the surface state of the stencil or parts. The camera 140 preferably uses a camera with a built-in CD (Charge Coupled Device) having a magnification of approximately 100 times to accurately check the surface of the stencil or the component.

The lower end of the camera 140 is further provided with a luminaire 142 for illuminating the light so that the camera 140 can recognize the surface state of the stencil or parts.

One side of the work table 100 configured as described above displays the contents of the digital counter 220 and the camera 140 and the digital counter 220 for designating and reading the position of the examination table 120. A display unit mounting table 200 on which a computer (240) or the like to be stored is installed is provided.

The display unit mounting table 200 has a shape in which the front is opened in a generally rectangular shape. Accordingly, the computer 240 and the digital counter 220 are installed to be able to draw in and out from the front, and a monitor 260 displaying the contents of the computer 240 is installed on the upper side, and the computer 240 The switch box (280) is further provided on the side of the work table 100 and the computer 240 of the display unit mounting table 200 to supply power.

Meanwhile, referring to the wiring connection diagrams of the components installed in the work table 100 and the display unit mounting table 200, as shown in FIG. 3, power applied from a power code P is applied to the switch box 280. Leads to.

The switch box 280 is connected to the power supply is connected to the power supply (Power supply 160), the monitor 260, the digital counter 220 is connected to the camera 140 to supply power. The X (X) -Y (Y) axis linear scale connection line of the work table 100 is connected to the rear end of the digital counter 220 and the RS232 port of the rear end of the digital counter 220. Port is connected to the computer 240.

In addition, the cable of the camera 140 is connected to the front of the amplifier 180, and the cable of the camera 140 from the rear of the amplifier 180 is connected to the input terminal of the monitor 260.

In addition, the cable coming from the luminaire 142 of the camera 140 is connected to the power supply 160.

Next, an operation method of the stencil checker according to the present invention having such a configuration will be described.

As shown in FIG. 4, the operation method of the stencil checker starts from a power input step S10 of first turning on a power switch (not shown) of the switch box 280. When power is applied in the power input step (S10), a setting step (S20) of placing the stencil or parts on the inspection table 120 to check the surface state is performed.

Then, by operating the Y (Y) axis handle 122 and the X (X) axis handle 124 of the work table 100 to move the test table 120 to the desired position to move the test table (S30) Will proceed. In the inspection table moving step (S30), since the inspection table 120 is moved back and forth or left and right using a linear scale having an error of 0.001 mm, the inspection table 120 precisely changes the surface state of the stencil or the component. You will move a little to see.

After the inspection table moving step (S30), the photographing step (S40) of photographing the surface state of the stencil or parts with the camera 140 is in progress. In the photographing step (S40), the display coordinate of the digital counter 220 is reset to zero to measure the opening size of the stencil or the soldering state of the component. After moving to the coordinate to be measured by using the X-axis handle 124 and the Y-axis handle 122, the numerical value is loaded on the digital counter 220 to be displayed. .

Then, the storage step (S50) of storing the numerical value and the screen shot in the shooting step (S40) in the computer 240 is in progress. The storage step (S50) is to be stored in the computer 240 and at the same time to display the content taken in the shooting step (S40) to the monitor 260.

Here, the numerical values stored in the computer 240 are converted into data, and the stencil or component surface state is analyzed by an image image so that the wear state of the stencil or the defect of the component may be systematically managed.

The scope of the present invention is not limited to the above-exemplified embodiments, and many other modifications based on the present invention may be made by those skilled in the art within the above technical scope.

As described in detail above, in the stencil checker and its operation method according to the present invention, a component having a solder cream applied to a stencil or a pad of a printed circuit board having an opening having the same shape as a pad of a printed circuit board. The camera and the computer are installed so as to photograph and inspect the surface state of the camera, and store the captured contents.

Therefore, all the workers can check the surface condition of the stencil and the parts in the same way with the same equipment, it is expected that the work process can be unified.

In addition, the surface state of the stencil and the parts can be checked with an error range of 0.001 mm through a CCD camera having a magnification of 100 times. Therefore, the effect of managing numerical data in the process is expected. .

In addition, by storing the numerical values and images taken by the camera as an image file, it is possible to edit and analyze the details of the wear state of the stencil and the defects of the parts, and thus, the effect of establishing a countermeasure against the process failure is also expected.

As a result, the stencil checker according to the present invention can establish countermeasures for process defects, thereby preventing such defects in advance, and minimizing the loss time of the surface mount technology (SMT). This leads to the effect of improving the operation rate of the process and equipment.

Claims (6)

delete An inspection table on which a stencil having an opening having the same shape as that of a pad of a printed circuit board (PCB) or a component having a solder cream applied to the pad of the printed circuit board is mounted; A camera provided at one side of the inspection table and photographed to check a surface state of the stencil or parts; A digital counter provided at one side of the inspection table to designate and read the position of the inspection table; It is provided on one side of the digital counter, and comprises a computer (Computer) to display and store the contents of the camera and the digital counter, On one side of the test stand, A Y axis handle for adjusting the inspection table to flow in the front and rear directions, Stencil (Stencil) inspector, characterized in that the X (X) handle is provided to adjust the flow in the horizontal direction. An inspection table on which a stencil having an opening having the same shape as that of a pad of a printed circuit board (PCB) or a component having a solder cream applied to the pad of the printed circuit board is mounted; A camera provided at one side of the inspection table and photographed to check a surface state of the stencil or parts; A digital counter provided at one side of the inspection table to designate and read the position of the inspection table; It is provided on one side of the digital counter, and comprises a computer (Computer) to display and store the contents of the camera and the digital counter, On one side of the camera Stencil (Stencil) inspection device further comprises a lighting device for illuminating the light so that the camera can recognize the surface state of the stencil or parts. A power input step of turning on a power switch of a switch box; A setting step of placing a stencil or a part for checking the surface condition on the inspection table; An inspection step moving step of moving the inspection table to a desired position; A photographing step of photographing a surface state of the stencil or parts with a camera; Operating method of a stencil (Stencil) checker characterized in that it comprises a storage step for storing the content taken in the shooting step to a computer (Comouter). 5. The method of claim 4, wherein, in the step of moving the test bench, the test bench is moved back and forth or left and right by using a linear scale. 5. The method of claim 4, wherein in the photographing step, contents photographed by the camera are designated and displayed on a digital counter.

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