JP2697678B2 - How to register bridge inspection target of mounted components - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soldering failure of a component mounted on a printed circuit board, particularly a phenomenon of short-circuiting between electrodes due to soldering (hereinafter referred to as "bridge"). More particularly, the present invention relates to a method for registering a bridge inspection target of a mounted component for determining and registering a partner electrode to be subjected to a bridge inspection for each electrode of each mounted component. 2. Description of the Related Art Normally, when conducting a bridge inspection of a mounted component, it is necessary for an attendant to register a partner electrode to be subjected to a bridge inspection for each electrode of all mounted components prior to the inspection. . Conventionally, as this kind of registration method, the staff manually operates the teaching unit and registers each bridge inspection target one by one, or specifies all the electrodes as the bridge inspection target and specifies the non-inspection target from among them There is a way to delete it. However, in the case of the above-mentioned registration method, since the attendant registers each object of the bridge inspection one by one, the work load of the attendant becomes extremely large, and fatigue is easily caused. In addition, since the registration work takes time, there is a problem that the work efficiency is low and a registration error is likely to occur. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a method of registering a bridge inspection target of a mounted component, which can automate the registration work of an inspection target position. In order to achieve the above object, according to the present invention, there is provided electrode connection information for designating an electrode to be connected with each electrode of each component to be soldered on a printed circuit board. Based on the component mounting information for specifying the mounting position of each component on the printed circuit board and the component shape information for specifying the position of each electrode of each component, the bridge inspection target for each electrode of each component Is determined and registered. According to the bridge inspection object registration method of the present invention, a distance between each electrode of each component and another electrode is determined based on the component mounting information and the component shape information, and then the distance is less than a threshold value and Only the electrodes not included in the connection information are extracted and registered as bridge inspection targets. A bridge inspection target is extracted from the electrode connection information, component mounting information, and component shape information by calculating the distance between electrodes and comparing threshold values. This makes it possible to automate the registration work, reduce the work load on the staff, increase the efficiency of the registration work, and prevent the occurrence of registration errors. FIG. 3 shows a first embodiment mounted on a printed circuit board.
The positional relationship between second components (for example, surface mount components) 1 and 2 is illustrated. The first component 1 is, for example, an IC,
A total of eight electrodes 3a to 3h are provided. The second component 2 is, for example, a resistor, and has a total of two electrodes 4a, 4a.
b. Although the electrode 3e of the first component 1 and the electrode 4a of the second component are electrically connected by the wiring pattern 5, in this embodiment, the other electrodes are electrically insulated from each other. Therefore, the electrode 3e of the first component 1 and the second component 2
A bridge may be generated between the first component 1 and the adjacent electrode 3a, as shown in FIG.
It is inconvenient that the bridge 6 occurs between e and 3f. When attention is paid to the electrode 3e of the first component 1, in the present invention, an electrode in a short distance region where a bridge easily occurs (for example, the adjacent electrode 3f of the first component 1 and the counter electrode 4a of the second component 2).
Among them, only the electrode 3f for which the occurrence of a bridge is inconvenient is extracted and registered as a bridge inspection target. FIG. 1 shows a specific procedure of a bridge inspection object registration method according to one embodiment of the present invention, and FIG. 2 shows an automatic registration system for automatically registering a bridge inspection object according to the present invention. I have. In FIG. 2, a bridge inspection object automatic registration system 10 has a PWB (Printed Wired Board) design CAD (Co
mputer Aided Design) Electrode connection information 1 from system 11
2, component mounting information 14 from the chip mounter 13, and component shape information 16 from the component shape registration system 15, respectively. The PWB design CAD system 11 is for automatically designing a wiring pattern on a printed circuit board using a computer, and the chip mounter 13 is for mounting a predetermined component at a specified position on the printed circuit board. . Also, the component shape registration system 15 files the component shape by inputting the component shape in a computer interactive manner based on, for example, a data sheet. FIG. 5 shows an example of the data structure of the electrode connection information 12 generated by the PWB design CAD system 11. This electrode connection information 12 is information indicating which electrode of each mounted component is electrically connected to which electrode of which other component by a wiring pattern, and FIG. Is associated with the number of electrodes to be connected and the list of connection electrodes. For example, an electrode with a component number "1" and an electrode with an electrode number "1" is a component with a component number p (1,1,1) and an electrode with an electrode number t (1,1,1). And a total of n (1,
1) The electrodes are electrically connected to the wiring pattern. FIG. 6 shows an example of the data structure of the component mounting information 14 held by the chip mounter 13. The component mounting information 14 is information indicating at which position on the printed circuit board each mounted component is to be mounted. The figure shows the component mounting position and component mounting direction on the printed circuit board for each of the M mounted components. And the part shape number is made to correspond. For example, a mounted component with a component number of “1” has a component shape number of R (1)
And the coordinate position on the printed circuit board (X (1), Y (1))
At a directional angle of θ (1). FIG. 7 shows a situation where a plurality of components 21 to 24 are mounted at predetermined positions on the printed circuit board 20 at a predetermined direction angle θ. In FIG.
In contrast, a board coordinate system 20A having the origin at the left corner in the figure is set, and a component coordinate system 21A to 24A having the origin at the center of each component is set for each of the components 21 to 24. Thus, each of the components 21 to 24 is positioned and fixed so that the center of each component is coincident with the component mounting coordinate position of the board coordinate system 20A. FIG. 8 shows an example of the data structure of the component shape information 16 generated by the component shape registration system 15.
The component shape information 16 is information indicating how many electrodes the component of each component shape number has and at which position each electrode is provided. The number and position of the electrodes held for each part are associated with each other. For example, the part with the part shape number “1” is Q
There are (1) electrodes, of which the electrode with the electrode number "1" is provided at the coordinate position (x (1,1), Y (1,1)) in the component coordinate system. FIG. 9 shows the shape of a component 30 having a total of eight electrodes 31a to 31h. A component coordinate system 30A having the component center as the origin O is set for the component 30 in the same figure, and the positions of the electrodes 31a to 31h are indicated by position vectors a to h from the coordinate origin O to the tip of each electrode. Returning to FIG. 2, the bridge inspection object automatic registration system 11 includes the electrode connection information 12 and the component mounting information 1.
By sequentially executing the control procedure shown in FIG. 1 based on the component information 4 and the component shape information 16, the partner electrode to be subjected to the bridge inspection is determined for each electrode of each component, and the bridge inspection target registration data 17 is generated. Is registered in a predetermined information storage medium. First, step 1 in FIG. 1 (“ST1” in FIG. 1)
), The component counter PC is initialized (PC = 1) and the first component is specified. In the following step 2, the electrode counter TC is initialized (TC = 1) and the first electrode is specified. Is done. The designated parts are now PCs and the designated electrodes are
Assuming TC, the position at which the component PC is mounted, that is, the center coordinate position ( _Xc , _Yc ) of the component PC in the board coordinate system.
Is represented by the following equation, and the component shape number q of the component PC is represented by the following equation (see FIG. 6). ## EQU1 ## [Equation 2] [Equation 3] On the other hand, when the coordinate position of the electrode TC on the component PC is (x ₀ , y ₀ ), each coordinate data x ₀ , y ₀ is given by the following equation. [Equation 4] (Equation 5) Next, the distance D between the electrode TC of the component PC and the electrode j of the component i is determined. In this case, if the coordinates of the electrode j in the substrate coordinate system of the component i are (x ₁ , y ₁ ), each coordinate is The data x ₁ and y ₁ are given by the following equations. (Equation 6) [Mathematical formula-see original document] In the above equation, X ₁ = X (i), Y
It is assumed that ₁ = Y (i) and r = R (i). Next, x ₀ , calculated by the above equations,
By substituting y ₀ , x ₁ , and y ₁ into the following equation, the distance D
Is calculated. (Equation 8) Thus, in step 3, the electrode j of the component i
Said distance D is determined whether or not less than a predetermined threshold value TH per, if it is less than the threshold value TH, this
Bridge inspection of electrode j of part i to electrode TC of part PC
As an elephant, it is added to the electrode list of the bridge inspection target .
The next step 4 is to perform the bridge inspection
It is determined whether or not there is an electrode listed in the elephant electrode list, and the process proceeds to step 5 if the determination is "YES". In this step 5, the electrode connection information 12 is referred to, and the list
It is checked whether the electrode j of the component i is electrically connected to the electrode TC of the component PC by a wiring pattern.
As a result, when it is determined that these electrodes are connected by a wiring pattern, there is no problem even if a bridge occurs between these electrodes, so it is not necessary to be subjected to a bridge inspection and is excluded from the electrode list. You. On the other hand, the electrode j of the component i is the electrode connection information.
If not included in 12, the electrode is determined as a bridge inspection target, and the electrode is registered as bridge inspection target registration data 17 in the next step 6. In the next step 7, it is determined whether or not the same processing has been performed for all the electrodes of the component PC. If the determination is "NO", the electrode counter TC is counted up in step 8. Returning to step 3, the same processing is repeated. If the determination in step 7 is "YES", the flow advances to step 9 to determine whether the same processing has been performed for all parts. If the determination is "NO", the part counter PC is counted up in step 10 and returns to step 2 to repeat the same processing. When the processing is completed for all parts, step 9 is "YE
S ", the duplicated registration data is deleted in step 11, and the registration procedure is completed. FIG. 10 shows bridge registration target registration data 1
7 shows an example of the data structure. The bridge inspection target registration data 17 associates the position coordinates of each electrode of each component in the board coordinate system, the number of bridge inspection targets, and the list of bridge inspection targets. For example, the electrode having the part number "1" and the electrode number "1" is located at the coordinate position (10, 20) in the board coordinate system, and the number of bridge inspection objects is two (the part number is "1"). The electrode with the electrode number "2" for the component "1" and the electrode with the electrode number "1" for the component with the component number "2" are registered. According to the present invention, as described above, the electrode connection information,
The calculation of the inter-electrode distance and the comparison of the threshold value are performed based on the component mounting information and the component shape information to extract the bridge inspection target, so that the registration operation can be automated by executing this in software. Therefore, compared to the conventional method, in which the clerk registers each bridge inspection object one by one, the work load on the clerk can be greatly reduced, and the registration work can be performed in a short time, so that the work efficiency is good and registration errors occur. It has remarkable effects of achieving the object of the invention, such as difficulty.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart showing a specific procedure of a bridge inspection object registration method according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating an automatic registration system for bridge inspection targets according to an embodiment of the present invention; FIG. 3 is a plan view showing a positional relationship between mounted components on a printed board. FIG. 4 is a plan view of a mounting component showing a state of occurrence of a bridge. FIG. 5 is an explanatory diagram showing an example of a data structure of electrode connection information. FIG. 6 is an explanatory diagram illustrating an example of a data structure of component mounting information. FIG. 7 is a plan view showing a component mounting state on a printed circuit board. FIG. 8 is an explanatory diagram illustrating an example of a data structure of component shape information. FIG. 9 is a plan view showing an example of the shape of a component. FIG. 10 is an explanatory diagram showing an example of a data structure of bridge inspection target registration data. [Description of Signs] 10 Bridge inspection object automatic registration system 12 Electrode connection information 14 Component mounting information 16 Component shape information 17 Bridge inspection object registration data

Claims (1)

(57) [Claims] The electrode connection information for specifying the electrode to be connected to each electrode of each component soldered on the printed circuit board, the component mounting information for specifying the mounting position of each component on the printed circuit board, A bridge inspection target registration method for determining and registering a partner electrode to be subjected to a bridge inspection for each electrode of each component based on component shape information for specifying a position of each electrode having the component, After determining the distance of each electrode of each component from other electrodes based on the mounting information and the component shape information, only the electrodes whose distance is less than the threshold value and not included in the electrode connection information are subjected to bridge inspection. A bridge inspection target registration method for a mounted component, which is extracted and registered as a target of the inspection. 2. The method of claim 1, wherein the electrode connection information is provided from a PWB design CAD system. 3. 2. The method according to claim 1, wherein the component mounting information is provided by a chip mounter. 4. The part shape information is input data relating to a part shape.
2. The method for registering a bridge inspection target of a mounted component according to claim 1, wherein the method is provided by a component shape registration system that receives and files a file .