KR102026914B1 - Vertical and horizontal plane identification method of multilayer ceramic capacitor using surface edge shape difference - Google Patents

Abstract

The present invention relates to a method of distinguishing a vertical and a horizontal plane of a multi-layer ceramic capacitor using a surface edge shape difference. The method extracts a gray line profile for pixels belonging to a test area to test a surface edge shape difference of a multi-layer ceramic capacitor, compares a gray value belonging to a reference surface profile of a center and a highest gray value of a first edge surface profile area belonging to one side to obtain a first angle formed by a first edge surface gray profile, compares the gray value belonging to the reference surface profile of the center and a highest gray value of a second edge surface profile area belonging to the other side to obtain a second angle formed by a second edge surface gray profile, and then compares the first and the second angle with a reference value to use a surface edge shape difference to determine a horizontal plane or a vertical plane. According to the present invention, a surface edge shape difference of a multi-layer ceramic capacitor can be used to determine whether a surface is a horizontal plane or a vertical plane to allow use in a process of mounting on a desired specific plane.

Description

VERTICAL AND HORIZONTAL PLANE IDENTIFICATION METHOD OF MULTILAYER CERAMIC CAPACITOR USING SURFACE EDGE SHAPE DIFFERENCE}

According to the present invention, when the laminated ceramic capacitor (MLCC) is mounted on a PCB or other object, the quality of the finished product may change depending on the surface on which the laminated ceramic capacitor is mounted. It relates to a method that can determine whether the vertical plane or horizontal plane using the surface edge shape difference of (MLCC).

In general, multilayer ceramic capacitors, also called multi-layer ceramic capacitors (MLCC), cut a very thin sheet of circuit patterned into a certain size, stack a large number of such sheets, press them by a press, and then It is a small size surface mount capacitor that is most commonly used at present, such as being cut to size, and is used for impedance matching in mobile communication devices, LC resonant circuits, and electromagnetic wave removal in digital devices.

When the multilayer ceramic capacitor (MLCC) is mounted on a PCB or other object, the quality of the finished product may vary depending on the surface on which the multilayer ceramic capacitor is mounted.

Conventionally, in order to align the laminated ceramic capacitors to one side, a batch alignment method is used through a magnetic alignment method using a property in which a specific surface of the laminated ceramic capacitor reacts to a magnet. The magnetic sorting method is a fast batch processing method, but the sorting accuracy is poor, and the sorting can be performed only on the surface that responds to the magnetic force. In addition, it is possible to align the multi-layer ceramic capacitor with magnets by setting them to meet various conditions such as distance, magnet type, and magnetic force. In addition, since the product is turned by the force of the magnet, friction with the surface may occur, which may damage the appearance of the laminated ceramic capacitor.

It is time to desperately need a system that can distinguish both the vertical plane and the horizontal plane of the laminated ceramic capacitor by improving the problems of the conventional magnetic alignment method.

Referring to FIG. 3, an example in which a horizontal plane and a vertical plane of a laminated ceramic capacitor are distinguished using the shape difference of the edge portion of the laminated ceramic capacitor is shown. The present invention intends to use the point that the edge portion of the laminated ceramic capacitor shows a difference in the geometrical features in the vertical plane and the horizontal plane.

Patent 10-1138465 (ceramic green sheet automatic laminating method and apparatus therefor)

The present invention is invented to solve the above problems, and extracts a gray line profile for a pixel belonging to the inspection area to inspect the surface edge shape difference of the laminated ceramic capacitor, and the gray value belonging to the center reference plane profile area. Comparing the highest gray value of the first edge surface profile region belonging to one side, the first angle formed by the first edge surface gray profile is obtained, and the gray value belonging to the center reference surface profile region and the second edge surface profile region belonging to the other side By comparing the highest gray value of, obtain the second angle formed by the second edge surface gray profile, and then compare the first angle and the second angle with the reference value to determine whether it is horizontal or vertical using the surface edge shape difference. The purpose of the present invention is to provide a vertical and horizontal plane discrimination method for a laminated ceramic capacitor using surface edge shape differences. .

In order to achieve the above object, the present invention is to determine the vertical and horizontal plane of the laminated ceramic capacitor by using the surface edge shape difference to determine whether the surface mounted on the tray of the multilayer ceramic capacitor (MLCC) vertical or vertical plane Setting an inspection area for inspecting a surface edge shape difference of the multilayer ceramic capacitor (MLCC); Extracting a gray line profile by converting an RGB image of each pixel included in the inspection area into a gray image while scanning the inspection area in one direction; By using the extracted gray line profile, a gray value belonging to a center reference plane profile area is compared with a highest gray value of a first edge plane profile area belonging to one side, thereby forming a first edge surface gray profile compared to the reference plane gray profile. The edge surface is obtained by comparing the gray value belonging to the center reference plane profile area with the highest gray value of the second edge plane profile area belonging to the other side and obtaining the second angle formed by the second edge plane gray profile relative to the reference plane gray profile. Angle extraction step; And comparing the first angle and the second angle with a reference value, determining that the inspection area is a horizontal plane when the reference angle is greater than or equal to the reference value, and determining that the inspection area is a vertical plane when less than the reference value.

In the setting of the inspection area, after confirming the left and right length and the vertical width of the laminated ceramic capacitor, the inspection center (X, Y) is set, and the rectangular inspection area is set based on the inspection center position (X, Y). The rectangular inspection region is formed inside the body region so as to be filled in the center body region between the left and right electrode regions of the multilayer ceramic capacitor.

The left and right lengths and the top and bottom widths corresponding to the rectangular inspection area may be obtained as percentages by applying different ratios to the left and right lengths and the top and bottom widths of the laminated ceramic capacitor, respectively.

The extracting of the gray line profile may include obtaining gray image values from left to right or right to left along the left and right length directions for each pixel belonging to the rectangular inspection area, and then calculating the gray image values of the corresponding columns. The average value of all the columns is obtained by adding the average value and the average value of the next column. The gray line profile is extracted using the average value of the gray image.

The extracting of the gray line profile may include: an average value of the column-based gray image from the top column to the bottom column while moving from one electrode region to the other electrode region for each pixel belonging to the rectangular inspection region; We obtain in order, and extract the gray line profile using this.

In the step of extracting the edge surface angle, a predetermined range belonging to the center of the gray line profile is set as the reference plane profile area at the center, a predetermined range belonging to one side is set as the first edge surface profile area, and a predetermined range belonging to the other side. The range is set to the second edge surface profile area.

Further, the step of extracting the edge surface angle may include the distance between the pixel minus the center pixel position of the reference surface profile region and the highest gray in the first edge surface profile region from the pixel position of the highest gray image value in the first edge surface profile region. The first angle is obtained using the difference of gray image values minus the average gray image value of the reference plane profile area, and the center pixel position of the reference profile area is determined from the pixel position of the highest gray image value in the second edge surface profile area. The second angle may be obtained by using a difference between the subtracted pixel and the gray image value obtained by subtracting the average gray image value of the reference surface profile region from the highest gray image value in the second edge surface profile region.

The determining may include obtaining an average value after adding the first angle and the second angle, comparing the reference value with a reference value, and determining that the inspection area is a horizontal plane if the reference value is greater than or equal to the reference value.

According to the present invention having the above configuration, the following effects can be achieved.

It is possible to determine whether the surface is a vertical plane or a horizontal plane by using the surface edge shape difference of the laminated ceramic capacitor, and thus it can be used for the process of mounting on the desired specific surface.

Compared with the conventional magnetic alignment method, the alignment can be performed with much higher accuracy, and the specific surface of the multilayer ceramic capacitor can be determined by setting the conditions of the software for image processing.

Furthermore, there is no possibility of damaging the multilayer ceramic capacitor because it is not a method of using physical force such as the force of the magnet.

1 is a flow chart of the vertical and horizontal plane discrimination method of the laminated ceramic capacitor using the surface edge shape difference according to the present invention
2 is a block diagram of an MLCC vertical horizontal discrimination apparatus for performing a vertical and horizontal plane discrimination method of a multilayer ceramic capacitor using a surface edge shape difference according to the present invention.
3 is an exemplary diagram for distinguishing a horizontal plane and a vertical plane of a laminated ceramic capacitor using the shape difference of the edge portion of the laminated ceramic capacitor.
4 is an exemplary view of an inspection area set up to extract a gray line profile in accordance with the present invention.
5 is an exemplary diagram illustrating a method for extracting a gray line profile in accordance with the present invention.
6 is an exemplary view illustrating a method of extracting angle data of one edge surface and the other edge surface according to the present invention.
7 is an exemplary view showing a result of determining a vertical plane and a horizontal plane using a gray line profile extracted according to the present invention.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail with reference to the accompanying drawings.

However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms.

In this specification, the embodiments are provided so that the disclosure of the present invention may be completed and the scope of the present invention may be completely provided to those skilled in the art.

And the present invention is only defined by the scope of the claims.

Thus, in some embodiments, well known components, well known operations, and well known techniques are not described in detail in order to avoid obscuring the present invention.

In addition, the same reference numerals throughout the specification refer to the same components, and the terminology (discussed) used herein is for the purpose of describing the embodiments are not intended to limit the invention.

As used herein, the singular forms "a", "an" and "the" include plural unless the context clearly dictates otherwise, and the elements and acts referred to as 'comprises' or 'do' not exclude the presence or addition of one or more other components and acts. .

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art.

In addition, the terms defined in the commonly used dictionary are not ideally or excessively interpreted unless they are defined.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 and 2, in the vertical and horizontal plane discrimination method of the multilayer ceramic capacitor using the surface edge shape difference according to the present invention, the surface edge of the multilayer ceramic capacitor (MLCC) mounted on the tray is a horizontal plane or a vertical plane. A vertical and horizontal plane discrimination method of a laminated ceramic capacitor for determining by using a shape difference.

Each step of the present invention is performed using the MLCC vertical horizontal discrimination apparatus 100, and the MLCC vertical horizontal discrimination apparatus 100 includes the inspection area setting unit 110, the gray line profile extracting unit 120, and the edge surface angle extraction. The unit 130 and the horizontal vertical determination unit 140 is included.

Each step of the present invention will be described as follows.

First, the inspection region setting unit 110 sets an inspection region to inspect the surface edge shape difference of the multilayer ceramic capacitor MLCC (S110).

Referring to Figure 4, after checking the left and right length (L) and the vertical width (W) of the laminated ceramic capacitor set the inspection center (X, Y), the rectangular inspection area based on the inspection center position (X, Y) In this case, the rectangular inspection region is formed inside the body region so as to be filled in the center body region between the left and right electrode regions of the laminated ceramic capacitor.

Here, the left and right lengths and the top and bottom widths corresponding to the rectangular inspection area are calculated as percentages by applying different ratios to the left and right lengths L and the top and bottom widths W of the laminated ceramic capacitor, respectively. For example, the left and right lengths corresponding to the rectangular inspection area are set to 45% of the left and right lengths L of the laminated ceramic capacitor, and the upper and lower widths corresponding to the rectangular inspection area are the upper and lower widths W of the laminated ceramic capacitor. 95% can be set.

Since the rectangular inspection area should include the edge portions of both sides, it is preferable to set the upper and lower widths of the inspection area to a level substantially similar to the upper and lower widths (W) of the laminated ceramic capacitor, and the left and right lengths of the inspection area are the center body area. It may be desirable to set much smaller than the left and right length (L) of the laminated ceramic capacitor.

The inspection area to inspect the surface edge shape difference is expressed as follows.

MLCC outline size detected (L) x (W)

-Horizontal center point position (CL) = L / 2

-Longitudinal center point (CW) = W / 2

-Inspection areas (W) and (L) are set as a percentage of the size of MLCC outer size (L) and (W).

-Inspection area (Left) = CL-Inspection area (L) / 2

-Inspection area (Right) = CL + inspection area (L) / 2

-Inspection area (Top) = CW + inspection area (W) / 2

-Inspection area (Bottom) = CW-Inspection area (W) / 2

The gray line profile extractor 120 extracts the gray line profile by converting the RGB image of each pixel included in the inspection area into a gray image while scanning the inspection area in one direction (S120).

Referring to FIG. 5, the gray image values are obtained from left to right or right to left along the left and right length directions for each pixel within the rectangular inspection area, and then the gray image values of the corresponding columns are added to obtain an average value. In the same way, the average value of the gray image is obtained for all columns, and then the gray line profile is extracted.

Then, for each pixel belonging to the rectangular inspection area, the average value of the gray image of the column unit is sequentially obtained from the topmost column to the bottommost column while proceeding from one electrode region to the other electrode region. Extract.

Referring to FIG. 5, if the number of pixels corresponding to the inspection area L is 50 and the number of pixels corresponding to the inspection area W is 100, one profile is extracted for the W area by the following equation.

Average (W1) = (L₁ + L₂ + L₃ ㆍ ··· + L ₅₀ ) / 50

Average (W2) = (L₁ + L₂ + L₃ ㆍ ··· + L ₅₀ ) / 50

ㆍ ····

Average (W100) = (L₁ + L₂ + L₃ ···· + L ₅₀ ) / 50

The edge plane angle extractor 130 compares the gray value belonging to the center reference plane profile area with the highest gray value of the first edge plane profile area belonging to one side by using the extracted gray line profile to compare the first gray plane profile with the first gray plane profile. The first angle formed by the edge surface gray profile is calculated, and the gray value belonging to the center reference surface profile area is compared with the highest gray value of the second edge profile area belonging to the other side, and the second edge surface gray profile is compared to the reference gray profile. A second angle is formed to obtain (S130).

Referring to FIG. 6, a predetermined range belonging to the center of the gray line profile is set as the center reference plane profile region, a predetermined range belonging to one side is set as the first edge surface profile region, and a predetermined range belonging to the other side is set. The second edge surface profile area is set.

The distance between the pixel minus the center pixel position of the reference plane profile region from the pixel position of the highest gray image value in the first edge surface profile region and the gray of the reference plane profile region at the highest gray image value in the first edge surface profile region The first angle Θ 'is obtained by using the difference of gray image values minus the image average value.

Further, the distance between the pixel minus the pixel position of the highest gray image value in the second edge surface profile area minus the center pixel position of the reference plane profile area and the gray of the reference plane profile area at the highest gray image value in the second edge surface profile area. The second angle Θ "is obtained by using the difference of gray image values minus the image average value.

Referring to FIG. 6, a method of obtaining the first angle Θ 'and the second angle Θ "is as follows.

① Ref_Avg (g) = average gray value of the reference profile area

② Ref (cx) = center pixel position of the reference plane profile area

③ Left_Top (ty) = (L) The highest gray value in the edge profile area

Right_Top (ty) = (R) The highest gray value in the edge profile area.

Left (lx) = pixel position of highest gray value in the edge area of the (L) edge

⑥ Right (rx) = (R) edge pixel position of highest gray value in profile area

-. Edge ground angle calculation method

⑦ Distance Pixels (L) = ⑤-②

⑧ Difference Gray Level (L) = ③-①

First angle Θ '= arctan (⑧, ⑦)

⑨ Distance Pixels (R) = ⑥-②

If Difference Gray Level (R) = ④-①

Second angle Θ "= arctan (⑩, ⑨)

The horizontal and vertical determination unit 140 compares the first angle Θ 'and the second angle Θ "with a reference value and determines that the inspection area is a horizontal plane if the reference value is greater than or equal to the reference value, and determines that the inspection area is a vertical plane if it is less than the reference value (S140). .

Here, an average value is obtained after adding the first angle Θ 'and the second angle Θ ", and compared with the reference value to determine the inspection area as the horizontal plane, and when the reference value is less than the reference value, it is determined as the vertical plane.

Referring to FIG. 7, the result obtained by obtaining the first angle Θ 'with respect to the first edge surface belonging to one side and the second angle Θ "with respect to the second edge surface belonging to the other side in the same manner as described above is shown. It can be seen that the left line profile whose angle average value is 40.10 is determined as the horizontal plane TOP as the reference value or more, and the right line profile whose angle average value is 2.52 is less than the reference value as the vertical plane SIDE.

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features, The embodiments are to be understood in all respects as illustrative and not restrictive.

In addition, the scope of the present invention is specified by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be interpreted as

100 ... MLCC Vertical Leveling Unit
110 ... Inspection area setting part
120 ... Gray Line Profile Extractor
130 ... Edge angle extractor
140 ... Horizontal Vertical Judgment

Claims (8)

As a vertical and horizontal plane discrimination method of a laminated ceramic capacitor for determining whether a surface mounted on a tray is a horizontal plane or a vertical plane using a surface edge shape difference,
Setting an inspection area for inspecting a surface edge shape difference of the multilayer ceramic capacitor (MLCC);
Extracting a gray line profile by converting an RGB image of each pixel included in the inspection area into a gray image while scanning the inspection area in one direction;
By using the extracted gray line profile, a gray value belonging to a center reference plane profile area is compared with a highest gray value of a first edge plane profile area belonging to one side, thereby forming a first edge surface gray profile compared to the reference plane gray profile. The edge surface is obtained by comparing the gray value belonging to the center reference plane profile area with the highest gray value of the second edge plane profile area belonging to the other side and obtaining the second angle formed by the second edge plane gray profile relative to the reference plane gray profile. Angle extraction step; And
Comparing the first angle and the second angle with a reference value and determining that the inspection area is a horizontal plane when the reference angle is greater than or equal to a reference value and determining that the inspection area is a vertical plane by less than the reference value;
Including,
The determining step,
The average value is obtained after adding the first angle and the second angle, and compared with the reference value, the average value is determined to be equal to or greater than the reference value, and the test area is determined to be a horizontal plane. Determination of vertical and horizontal planes of ceramic capacitors.
The method according to claim 1,
Setting the inspection area,
After checking the left and right length and the vertical width of the laminated ceramic capacitor, set the inspection center (X, Y) and set the rectangular inspection area based on the inspection center position (X, Y), but the rectangular inspection area is the laminated ceramic capacitor. The vertical and horizontal plane discrimination method of the laminated ceramic capacitor using the surface edge shape difference, characterized in that formed on the inside of the body region so as to be filled in the center body region between the left and right electrode regions of the.
The method according to claim 2,
The vertical and horizontal lengths of the laminated ceramic capacitor using the surface edge shape difference, which are obtained by applying different ratios to the left and right lengths and the upper and lower widths of the laminated ceramic capacitors, respectively, as a percentage. How to determine the horizontal plane.
The method according to claim 2,
Extracting the gray line profile,
For each pixel belonging to the rectangular inspection area, gray image values are obtained in order from left to right or right to left along the left and right length directions, and then the average value is obtained by adding up all gray image values of the corresponding column. A method for discriminating vertical and horizontal planes of laminated ceramic capacitors using surface edge shape differences, wherein the average values of gray images are obtained for all columns in such a manner that the average values are obtained.
The method according to claim 2,
Extracting the gray line profile,
For each pixel belonging to the rectangular inspection region, the average value of the gray image of the column unit is sequentially obtained from the uppermost column to the lowermost column while proceeding from one electrode region to the other electrode region, and extracting a gray line profile using the same. A vertical and horizontal plane discrimination method of a laminated ceramic capacitor using a surface edge shape difference.
The method according to claim 1,
In the edge surface angle extraction step,
A predetermined range belonging to the center of the gray line profile is set as the center reference surface profile area, a predetermined range belonging to one side is set as the first edge surface profile area, and a predetermined range belonging to the other side is set to the second edge surface profile area. The vertical and horizontal plane discrimination method of the laminated ceramic capacitor using the surface edge shape difference, characterized in that set to.
The method according to claim 6,
The edge surface angle extraction step,
The distance between the pixels of the highest gray image value in the first edge profile area minus the center pixel position of the reference profile area and the mean gray image of the reference profile area at the highest gray image value in the first edge profile area Find the first angle using the difference of gray image values minus
The average value of the gray image of the reference profile area at the pixel position of the highest gray image value in the second edge profile area minus the center pixel position of the reference profile area and the highest gray image value in the second edge surface profile area. A method for discriminating vertical and horizontal planes of laminated ceramic capacitors using a surface edge shape difference, wherein the second angle is obtained by using a difference of gray image values obtained by subtracting.
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