JP3269516B2 - Mounting board inspection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting board inspection apparatus for inspecting the mounting state of a mounting board on which a number of components such as chips are soldered, and more particularly, to forming in advance teaching data for mounting board inspection. TECHNICAL FIELD The present invention relates to a correction teaching of teaching data for mounting board inspection and a mounting board inspection apparatus which requires screen division when inspecting a mounting board using the correction teaching.

[0002]

2. Description of the Related Art In recent years, a mounting board inspection apparatus for automatically inspecting the quality of soldering of a component or the like on a printed board using an image processing technique has been put to practical use.

When inspecting the mounting state of a printed board using this mounting board inspection apparatus, prior to the inspection, what components are mounted at which positions on the printed board and in which directions. Mounting information indicating whether the inspection is to be performed, control information indicating in what sort of screen / order the inspection is to be performed, and an inspection standard indicating the inspection standard for each mounted component. It is necessary to teach the device.

[0004] Generally, this kind of teaching operation is called "teaching". In particular, the work of setting mounting information and control information is called "initial teaching", and the work of setting inspection criteria is called "correction teaching".

In the above-described mounting board inspection apparatus, a great deal of labor and time are required for teaching, and when this apparatus is installed in a manufacturing line, the manufacturing line is stopped during the teaching operation. There is a problem that the productivity has to be reduced.

In order to solve this problem, a plurality of light sources arranged at different elevation angles with respect to the printed circuit board are provided, the printed circuit board is illuminated by these light sources, and reflected light from the board is imaged by a video camera. There has been a mounting board inspection apparatus that observes an image obtained by the above-described process and extracts mounting information such as a position of each component from a soldered portion, an inclined state thereof, and the like.

However, in such a mounting board inspection apparatus, the information to be inspected is only the mounting information of the component, and the operator himself performs the correction teaching work, that is, the setting of the inspection standard for judging the quality of the component. Need
At that time, since the operator himself will divide the screen of the board as appropriate,
There is a problem that teaching workability is poor.

In order to solve this problem, in the above-described mounting board inspection apparatus, there has been a mounting board inspection apparatus that performs an automatic inspection even in the correction teaching using the same screen division information as the actual board inspection.

[0009]

SUMMARY OF THE INVENTION
In the mounting board inspection apparatus, the same screen allocation information is used for the correction teaching and the inspection. Therefore, the screen allocation information may temporarily reduce the inspection time per board (hereinafter simply referred to as tact time). in the case that has been set on the screen breaking rules, because the components are entering complex on one screen, fall is the efficiency of the modified teaching work worker.

On the other hand, there is a problem that the tact time is reduced if a screen division rule in which parts relations are properly adjusted so as not to lower the efficiency of the operator's correction teaching work.

Therefore, the present invention has been made in view of the above problems,
The purpose of the present invention is to provide a mounting board inspection apparatus that sets a screen division that can efficiently perform this work during a correction teaching operation, and sets a screen division that can efficiently perform an inspection during an inspection. And

[0012]

In order to achieve the above-mentioned object, an invention according to claim 1 is a teaching method for inspecting a mounting board having mounting information including a position, a component type, and a size of a component on the mounting board. When the data is formed in advance and the mounting board inspection teaching data is corrected and the mounting board is inspected using this correction teaching, the mounting board inspection device that requires screen splitting is used for the above-mentioned correction teaching. It is characterized by comprising a first screen split forming means for forming a required screen split and a second screen split forming means for forming a screen split required for inspecting the mounting board.

According to a second aspect of the present invention, in the first aspect of the present invention, the first screen splitting means sets an initial solution of a screen split required at the time of the correction teaching from the mounting information. First screen initial solution setting means, and first screen optimum solution setting means for setting an optimal solution from the initial screen division solution set by the first screen initial solution setting means;
And a first screen ordering setting means for setting the ordering of the screens to minimize the imaging moving distance based on the optimum solution set by the first screen optimum solution setting means.

According to a third aspect of the present invention, in the first aspect of the present invention, the second screen splitting means sets an initial solution of a screen split required for inspecting the mounting board from the mounting information. A second screen initial solution setting means for performing, and a second screen optimum solution setting means for setting an optimum solution from the initial solution of the screen division set by the second screen initial solution setting means;
A second screen sequence setting unit configured to set a sequence of screens for minimizing an imaging movement distance based on the optimum solution set by the second screen optimum solution setting unit.

According to a fourth aspect of the present invention, based on the second aspect, the first screen initial solution setting means includes a screen including the inspection target component in an imaging range based on the mounting information of the inspection target component. A first search means for searching for a part, and a first initial state for judging whether or not there is a part which can be covered simultaneously with the inspection target part by appropriately moving a screen searched by the first search means. When the solution determining means and the first initial solution determining means determine that there is a component which can be covered simultaneously with the inspection target component, the position of the screen searched by the first searching means is determined by the inspection. If the position is changed to a position that can be covered simultaneously with the target component, and if it is determined that there is no component that can be covered at the same time as the inspection target component, the first screen updating means as the original screen position Have The features.

[0016]

According to a fifth aspect of the present invention , in the third aspect of the invention, the second screen initial solution setting means includes a screen including the inspection target component in an imaging range based on the mounting information of the inspection target component. A second search means for searching for a part, and a second initial state for judging whether or not there is a part that can be covered simultaneously with the inspection target part by appropriately moving the screen searched by the second search means. When the solution determining means and the second initial solution determining means determine that there is a component that can be covered simultaneously with the inspection target component, the position of the screen searched by the second searching means is determined by the inspection. The position is changed to a position that can be covered simultaneously with the target component. On the other hand, if it is determined that there is no part that can be covered simultaneously with the inspection target component, the second screen updating unit sets the original screen position. Have The features.

[0018]

The invention according to claim 6 is the invention according to claim 2.
In the description, the first optimal solution setting means reads one reference screen from the initial solution, and searches the initial solution for a screen that is at least partially included in a predetermined range from the reference screen. A search means, and a value obtained by adding the number of parts covered by those screens to the total number of screens searched by the first screen search means, and an evaluation value for obtaining the optimum solution from the initial solution. A first evaluation value calculating unit that performs the evaluation and the evaluation values calculated by the first evaluation value calculating unit are arranged in the order from the highest to the lowest in the screen searched by the reference screen and the first screen searching unit. First optimal solution determining means for determining whether or not all parts can be covered by one screen; and the first optimal solution determining means includes a reference screen and the first screen searching means. All the parts in the searched screen on one screen If it is determined that the reference screen and the screen searched by the first screen search means are deleted from the initial solution, all the screens in the reference screen and the screen searched by the first screen search means are deleted. The position of the screen covering the part is newly added to the initial solution, and the processing of the first optimal solution determining means is ended. On the other hand, if it is determined that the screen cannot be covered by one screen, the initial solution A first initial solution updating means for outputting to the first optimal solution judging means an instruction to perform processing of the value obtained by reducing the evaluation value by one without changing the reference screen position. It is characterized by.

According to a seventh aspect of the present invention , in the third aspect of the present invention, the second optimum solution setting means reads one reference screen from the initial solution and sets one reference screen within a predetermined range from the reference screen. A second screen search means for searching for a screen included in the section from the initial solution, and a total number of screens searched by the second screen search means as an evaluation value for obtaining the optimal solution from the initial solution. A second evaluation value calculating unit, and the reference screen and the screens searched by the second screen searching unit in descending order of the evaluation values calculated by the second evaluation value calculating unit. A second optimal solution determining means for determining whether all parts can be covered by one screen; and a second optimal solution determining means for determining whether or not all parts can be covered by one screen by the reference screen and the second screen searching means. One part for all parts in the searched screen If it is determined that the screen is to be covered, the reference screen and the screen searched by the second screen search unit are deleted from the initial solution, and the screen is found in the reference screen and the screen searched by the second screen search unit. If the position of the screen covering all parts is newly added to the initial solution and the processing of the second optimal solution determining means is terminated, while it is determined that the screen cannot be covered by one screen, the initial solution is determined. A second initial solution updating means for outputting to the second optimal solution judging means an instruction to perform processing of the value obtained by reducing the evaluation value by one without changing the reference screen position of the solution. It is characterized by the following.

According to an eighth aspect of the present invention , in the second aspect of the present invention, the first screen ordering means connects the same screen among partial paths connecting the screens indicated by the optimal solution. First partial path selecting means for selecting two partial paths that do not exist and forming a set of partial paths;
Of the two different partial path sets formed by the first partial path selecting means, the partial path set having a shorter component path length is preferentially left, and the other set is deleted from the path selection candidates. A first route selection information deleting unit.

According to a ninth aspect of the present invention , in the third aspect of the present invention, the second screen ordering means connects the same screen among partial paths connecting the screens indicated by the optimal solution. Second partial path selecting means for selecting two partial paths that do not exist and forming a set of partial paths;
Of the two different partial path sets formed by the second partial path selecting means, the partial path set having a shorter component path length is preferentially left, and the other sets are deleted from the path selection candidates. A second route selection information deleting unit.

According to the present invention, since there are screen divisions at the time of the correction teaching and screen divisions at the time of actually performing the board inspection, each of the correction teaching work and the actual board inspection work is performed with different screen divisions. Can be performed.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a mounting board inspection apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a mounting board inspection apparatus according to this embodiment.

As shown in FIG. 2, for example, a printed board on which a large number of components including a square chip 100 having electrodes 100a at both ends and an IC 101 having a plurality of pins 101a are mounted, as shown in FIG. 10 is an apparatus for measuring the characteristics of the soldered portion of the component using predetermined parameters based on the image, and inspecting the mounted state of the mounted component based on the parameters. As shown, the XY table 1, the light projecting unit 2, the imaging unit 3, and the control processing unit 4 are configured.

The XY table 1 has a table on which the printed circuit board 10 to be inspected is fixedly mounted. The XY table 1 is configured to be horizontally moved to an arbitrary position based on a control signal of the XY table controller 51. ing.

As shown in FIG. 3, the light projecting section 2
Are arranged in such a manner that the elevation angles as viewed from the center O of the inspection area are in the order of the red light source 21, the green light source 22, and the blue light source 23, and the diameters of the blue light source 23 and the green light source 2 are
2. Ring light sources 21, 22, 2 in the order of red light source 21
3.

As the image pickup unit 3, for example, a color television camera (may be monochrome) is used. As shown in FIG.
It is arranged right above the inspection area, receives the reflected light of the red, green, and blue light irradiated from the light projecting unit 2 from the inspection area, converts the received reflected light into color signals of three primary colors, and performs control. It is configured to output to the processing unit 4.

The control processing section 4 includes a control section 41, an image memory 42, a component type table 43, a memory 44, an A / D conversion section 45, a soldered portion detection section 46, a determination section 47, a mounting information conversion section 48, Information converter 49, teaching data converter 50, XY table controller 51, keyboard 5
2, a display unit 53, a printer 54, and a floppy disk device 55.

In the correction teaching operation, the operator refers to the camera image of the printed circuit board 10 carried into the inspection position, and performs an inspection for each component on the substrate. enter the teachings data or pre-registered
The result of selecting from among those which had been while outputting the floppy disk device 55, when the test is based on the teaching data output to the floppy disk device 55, on the printed circuit board 10 which is carried into the test position The component is observed, the quality of the mounted state of the component is inspected from the observation information, and the inspection information is output to the floppy disk device 55.

The control section 41 controls the processing operation of the control processing section 4, and the image memory 42 stores the red, green and blue light image data received from the A / D conversion section 45. is there.

The component type table 43 stores information (hereinafter referred to as component type information) indicating the relative positional relationship between the soldered portions of the mounted components. For example, the component type information of the square chip 100 shown in FIG. 4 indicates that the component body has the soldered portions A at both ends and the shape of the soldered portion A is a semicircular shape.

The memory 44 includes a RAM and the like, and is used as a work area.

The A / D converter 45 is configured to convert each of the red, green, and blue light image signals received from the image pickup unit 3 into digital signals.

The soldering portion detecting section 46 reads out the image data from the image memory 42 and performs image processing such as binarization, filling and labeling to generate solder candidate data. Is configured.

Here, the solder candidate data refers to the substrate 10
It is data for specifying the soldered portion of the above mounted component, and has data such as the position and size of the soldered portion.

The determining section 47 refers to component type data, such as the positional relationship and size of the soldering portion for each component type registered in advance in the component type table 43, and the soldering portion detecting section 46 forms From the specified solder candidate data, a soldered portion is specified, a circumscribed rectangle indicating the shape of the component type is specified from the specified soldered portion, a positional relationship, a size, etc. are estimated from the specified circumscribed rectangle, and these are estimated. It is configured to output to the memory 44 as part information.

The mounting information conversion unit 48 is a component type table 4
Reference is made to the component type information, such as the positional relationship and size of the soldering portion for each component type, registered in advance in 3 and the component type, component position, and size are stored for each component information stored in the memory 44. It is configured to output mounting information such as the information.

The control information conversion unit 49 has two modes, a work priority mode in which the operator efficiently performs the correction teaching work and an inspection priority mode in which the actual board inspection is efficiently performed. With reference to the component mounting information, control information including screen division and screen ordering of the printed circuit board 10 to be inspected is output to the memory 44.

Here, the screen division means determining which parts and which parts are to be imaged at the same time, and setting the screen position of the imaging, and the screen ordering is set by the screen division. This refers to setting the order in which a plurality of screens (hereinafter, referred to as screen groups) are imaged.

In this embodiment, the following rules are determined as work priority rules used in the work priority mode. Rule One part must fit within one screen (camera field of view) where inspection criteria can be set at one time. Rules Order large screens that can be worked continuously for large parts that do not fit on one screen Rule Only one type of part can be displayed on one screen so that workers can work together for each part type if desired Do not fit, and display one type of parts in a continuous screen order.

The following rules are determined as inspection priority rules used in the inspection priority mode. Rules Ensure that the number of screens is small enough. The inspection order on the rule screen must be that the camera movement distance is short enough.

By the way, referring to FIG. 5, the screen division and the order of the screens in the work priority mode and the inspection priority mode will be described. In the work priority mode, components mounted as shown in FIG. In the printed circuit board 10 having the rule, the rule is applied on the screen 1 in FIG. 2B, and the rule is applied on the order from the screen 2 to the screen 3 in FIG. In the inspection priority mode, the rules are applied to the screen 1 and the screen 2 in FIG.
In ordering to, rules are applied.

Based on the mounting information obtained by the mounting information converting section 48 and the control information obtained by the control information converting section 49, the teaching data converting section 50 converts the position of the component, the type of the component, the size of the component, It is configured to form teaching data consisting of splitting and screen ordering.

The XY table controller 51 is configured to output a signal for arbitrarily setting an inspection area on the printed circuit board 10 placed on the XY table 1.

The keyboard 52 is used to input the size of the board, the type of the board, the processing mode, etc. before inspecting the printed board 10. The display unit 53 displays keyboard input information and information necessary for inspection. The printer 54 prints out information required by the operator.

The floppy disk device 55 records teaching data obtained by performing a teaching operation, and this teaching data is actually used when inspecting a printed circuit board.

Next, a description will be given of a teaching data creation process of the mounting board inspection apparatus according to this embodiment.

FIG. 6 is a flowchart showing the initial teaching process.

After the operator operates the keyboard 52 to register the name of the board to be taught and inputs the board size by key, the operator inserts the board 10 from the board entrance of the apparatus, and
When the table is conveyed to the table 1 (step 610) and the start key is pressed, the XY table 1 moves the table to the inspection area to be inspected first according to the instruction of the XY table controller 49, and the light projecting unit 2 moves to the inspection area. Irradiates three primary colors of red, green and blue light.

The image pickup section 3 picks up an image of the red, green and blue lights reflected from the inspection area, converts each of the picked up red, green and blue lights into a color signal, and converts this into an A / D converter. 4
5, the A / D conversion unit 45 outputs the red,
The color signals of green and blue are received, converted into digital signals and converted into image data, and the image data is stored in the image memory 42 (step 620).

The soldering portion detector 46 reads out the image data from the image memory 42, and pays attention to the characteristics of the image data, for example, the brightness and the saturation.
Image processing such as binarization, filling and labeling is performed to form solder candidate data, which is output to the memory 44.

Next, the judgment unit 47 sets the component type table 43
Referring to the component type data including the positional relationship and the size of the soldering portion for each component type registered in advance, the external connection indicating the shape of the component from the solder candidate data formed by the soldering portion detection unit 46. A rectangle is specified, and from the specified circumscribed rectangle, a component type (component type), a component position,
The size and the like are estimated, and these are used as component information in the memory 44.
(Step 630).

Subsequently, the mounting information conversion unit 48 determines
Using the component information formed in step 7, the mounting information such as the component type, component position, and size of each component is output to the memory 44 (step 640).

The control information conversion section 49 refers to the mounting information stored in the memory 44, and performs a “work priority control information setting process” for setting screen allocation and screen ordering used in the correction teaching work. Do. This processing will be described later in detail.

Based on the mounting information obtained by the mounting information converting unit 48 and the control information obtained by the control information converting unit 49, the teaching data converting unit 50 determines the position, type, size, The teaching data including the division, the ordering of the screens, the inspection criteria, and the like is formed and output to the memory 44 (step 660).

As the inspection standard, a value empirically obtained for each component type, for example, the number of pixels of the soldered portion for each component type is unconditionally set as a default.

Thereafter, the XY table 1 unloads the substrate for initial teaching to the substrate unloading port (step 67).
0), the initial teaching process ends.

FIG. 7 is a flowchart showing the correction teaching process.

When the operator inserts the sample substrate 10 to be corrected and taught from the substrate carry-in port of the apparatus and presses the start key, the XY table 1 reads the first substrate in the sample substrate 10 according to the teaching data obtained in the initial teaching. The inspection component is arranged at the imaging position (Step 710, Step 720). Note that the component that is placed at the imaging position and that is to be inspected is hereinafter simply referred to as a current component.

The soldering portion detecting section 46 performs image processing such as contour tracing and area measurement on the image information of the current component imaged by the imaging section 3 to form solder candidate data.
This is stored in the memory 44.

The determination unit 47 reads the solder candidate data from the memory 44, determines the acceptability of the current component by referring to the inspection criteria of the teaching data obtained in the initial teaching, and determines the result together with the pass / fail reason. 53 (step 730).

The operator determines whether or not the pass / fail result displayed on the display unit 53 correctly reflects the actual soldering state of the component (step 740).

If the operator determines that the pass / fail result displayed on the display unit 53 correctly reflects the actual soldering state of the component (step 740; Y), the operator checks the next component for inspection. (The next component is made current), the control unit 41 is activated from the keyboard 52 (step 760).

On the other hand, if it is determined that the information is not correctly reflected (step 740; N), the operator
In consideration of the pass / fail reason displayed in (1), the inspection reference value considered appropriate is changed using the keyboard 52 to change the inspection reference in the teaching data of the part (step 750), and the process returns to step 720. The same processing is performed.

At step 760, the operator operates the control unit 4 from the keyboard 52 so that the next part is inspected.
When the control unit 41 is started, the control unit 41 refers to the teaching data stored in the memory 44 to determine whether all the components have been inspected (step 770). As a result, the inspection is not completed. Is determined (step 77).
0; N), the process returns to step 720, and the same process as described above is performed. On the other hand, when it is determined that the inspection has been completed (step 770; Y), screen splitting with inspection priority is performed in accordance with the inspection priority rule. An instruction to execute the “control information conversion process with inspection priority” for setting the screen ordering is output to the control information conversion unit 49. This “control information conversion processing with inspection priority” will be described later in detail.

The control information conversion section 49 sets the screen division and the order of the screens according to the inspection priority rule according to the inspection priority rule described above (step 780).

The teaching data conversion unit 50 creates teaching data from the mounting information of each component formed by the mounting information conversion unit 48 and the control information set by the control information conversion unit 49, and outputs it to the memory 44. At the same time, the data is output to the floppy disk device 55 and the display device 53 (step 790).

Thereafter, the sample substrate 10 is carried out of the apparatus using the XY table 1 (step 795), and the correction teaching processing is completed.

Next, the control information conversion processing shown in steps 650 and 780 will be described.

Both of these control information conversion processes follow the respective rules (the work priority rule in step 660 and the inspection priority rule in step 780), and as shown in FIG. The required process (step 810) (hereinafter simply referred to as the initial solution setting process) is performed, and then again according to the above-described rules,
A process of deleting an unnecessary screen from the screen group set in the initial solution setting process to determine an optimum screen group (hereinafter, simply referred to as a screen optimization process) is performed (step 820), and further, the optimization is performed in accordance with each rule. The inspection order for the grouped screens (hereinafter simply referred to as screen ordering processing)
(Step 830).

Hereinafter, the initial solution setting processing in step 810, the screen optimization processing in step 820, and the screen ordering processing in step 830 will be described.

(1) The initial solution setting process in step 810 will be described with reference to a flowchart shown in FIG. 9 and an explanatory diagram shown in FIG.

Here, on the printed circuit board shown in FIG.
10, as shown in FIG. 10A, components 1 to 5 are mounted, and the positions and sizes of these components 1 to 5 are already stored in the memory 44 as mounting information. And

First, the control section 41 clears (initializes) the area for outputting the initial solution and the work area in the memory 44 (step 910).

When the initialization is completed, the control information converter 49
Reads the mounting information (position, size) of the component 1 stored in the memory 44, and retrieves the screen including this component 1 in the imaging range to obtain the screen 1 as shown in FIG. Step 920). Here, the screen has a fixed size, and corresponds to one imaging range.

Next, the control information conversion section 49
Then, after reading the mounting information of the component 2 which is the component to be inspected, which is stored in the screen 1, the screen 1 is appropriately moved so as to cover the read component 2 (step 930).

The control information conversion unit 49 determines whether or not the component 1 and the component 1, which are current components, can be simultaneously covered by the screen 1 (step 940). as a result,
If the control information conversion unit 49 determines that the screen 1 can cover not only the part 1 but also the part 2 as shown in FIG. 10C (step 940; Y), the position of the screen 1 Is changed to this position (step 960), if it is determined that the screen 1 cannot cover the part 2 at the same time as the part 1 (step 940; N), the part 2 Is newly added to the intermediate solution (step 950).

Here, the term "intermediate solution" refers to a description of a screen which is formed as needed in the process of forming an initial solution for describing a screen formed finally.

FIG. 10D shows a process similar to that of the above-described step 950. However, FIG. 10D shows that the screen 2 indicating the new screen is a screen that covers only the component 3.

As described above, the control information converter 49
The same processing as described above is performed for each component (step 9).
70). At this time, every time the processing is completed, the control information conversion unit 49 determines whether or not the inspection has been completed (whether or not the inspection target component exists) (Step 980).

If the control information conversion unit 49 determines that the inspection has been completed (step 980; Y), it outputs the intermediate solution to the memory 44 as the final initial solution (step 99).
0) While ending the initial solution determination process, if it is determined that the part to be inspected has not been completed yet (step 98)
0; N), the process returns to step 930, and the same processing as described above is performed.

Incidentally, in step 990, the memo 44
The position of the screen group indicated by the initial solution output in FIG.
Shows a screen 1 that covers the components 1 and 2, a screen 2 that covers the component 3, and a screen 3 that covers the components 4 and 5.

(2) Regarding the screen optimization processing in step 820, a flowchart as shown in FIG.
Description will be made with reference to the explanatory diagram shown in FIG.

Here, the printed circuit board 10 shown in FIG.
As shown in FIG. 12A, a screen having a screen 1 covering the component 1, a screen 2 covering the component 2, and a screen 3 covering the component 3 and the component 4 are provided as an initial solution. And

First, the control information converter 49 converts the initial solution stored in the memory 44 into a screen 1 as a reference screen.
Is read (step 110), and as shown in FIG. 12B, a screen that is at least partially included within a predetermined radius is searched from the center of the read screen 1 (step 12).
0).

As a result, the control information converter 49 displays the screen 1
Screen 2 as a screen that is at least partially included within a predetermined radius from the center of the screen, searches for parts covered by screen 1 and screen 2, and retrieves them (step 13).
0).

The control information conversion unit 49 uses the following equation (1) in the work priority mode.
An evaluation value is calculated using the equation (2) (step 14).
0).

Next, the control information conversion section 49 determines whether or not the screen 1 and all the components in the searched screen can be covered by one screen in ascending order of the calculated evaluation values. Is determined (step 150).

As a result, when the control information conversion section 49 determines that all the components in the screen searched as the reference screen are covered by one screen (step 150; Y), the screen is searched as the screen. The screen is deleted from the initial solution, and the position of the screen covering all the components in the reference screen and the searched screen is newly added to the initial solution (step 160), and the next screen is made current (step 170). On the other hand, if it is determined that the image cannot be covered by one screen (step 15
0; N), the processing is performed in the same manner as described above, with the evaluation value lowered by one without changing the reference screen position of the initial solution.

The evaluation value in the work priority mode is described by the following equation. Evaluation value = total number of screens + penalty when component is divided into a plurality of screens (1) Here, the penalty is the number of components covered by the plurality of screens.

The evaluation value in the inspection priority mode is described by the following equation. Evaluation value = total number of screens ... (2)

By the way, in FIG. 12C, since the part 1 covered by the screen 1 and the part 2 covered by the screen 2 can be covered by one screen, the screen 1 and the screen 2 are initialized. And the screen 1 is newly added to the initial solution.

In this way, the control information converter 49
The same processing as described above is performed for each screen (step 1).
70). At this time, every time the processing is completed, the control information conversion unit 49 determines whether or not there is a screen to be processed next (step 180).

If the control information conversion section 49 determines that there is a screen to be processed next, that is, if it determines that the processing is not to be terminated (step 180; N), the control information conversion section 49 returns the processing to step 120 and performs the same processing as described above. Process.

On the other hand, when the control information conversion unit 49 determines that there is no screen to be processed next, that is, when it determines that the processing has been completed (step 180; Y), the screen division has changed from the previous one. Is determined (step 19).
0), as a result, if it is determined that there has been a change (step 190; Y), the process returns to step 110, and the same processing as described above is performed. N), the screen position of the screen group is output to the memory 44 as an optimal solution (step 195), and the screen optimizing process ends.

(3) The screen ordering process in step 830 will be described with reference to a flowchart shown in FIG. 13 and an explanatory diagram shown in FIG.

Here, the printed circuit board 10 shown in FIG.
As shown in FIG. 2A, it is assumed that an optimal solution including a screen 1, a screen 2, a screen 3, a screen 4 and a screen 5 is given to the user.

First, the control information conversion unit 49 randomly allocates a path for screen ordering among the screens 1 to 5 (step 310). Hereinafter, in order to simplify the description, the diagram (a) is abstracted and displayed as shown in the diagram (b).

Next, the control information conversion unit 49 selects two partial routes whose order is not adjacent to each other as a set (step 320), and selects both the work priority mode and the inspection priority mode.
Basically, from the two sets selected as described above, one set of component paths with a short part path is preferentially left, and the other set is deleted from path selection candidates (step 330).

However, if the component is too large to fit on one screen, the screen covering this component is set as a continuous path.

Thus, the control information conversion unit 49
The same processing as described above is performed (step 340). At this time, every time the processing is completed, the control information conversion unit 49 determines whether or not the next processing exists (step 3).
50).

If the control information conversion section 49 determines that there are two sets of partial paths to be compared, that is, if it determines that the processing is not to be ended (step 350; N), it returns the processing to step 330, and The same processing is performed.

On the other hand, the control information conversion unit 49
If it is determined that the set of partial paths does not exist, that is, if it is determined that the processing has been completed (step 350;
Y), the remaining paths are output to the memory 44 as the optimal screen-ordered paths (step 190), and the screen ordering process ends.

The above processing will be described in detail with reference to FIG. 14. First, as shown in FIG. 14C, a path (1-2) connecting the screen 1 and the screen 2 and a path (1-2) connecting the screen 3 and the screen 4 ( 3-
4) is a set of partial paths (1-2, 3-4), and
As shown in FIG. (D), the route (1) connecting screen 1 and screen 3
-3) and the path (2-4) connecting the screen 2 and the screen 4 as another set of partial paths (1-2, 3-4), and a result of comparing the evaluation values of the two sets of partial paths. , Partial path (1-
Since the evaluation value of the set of (2, 3-4) is higher, this is adopted and the set of the partial path (1-2, 3-4) is deleted from the selection candidates.

Next, similarly, a partial route (1-2, 4-5) as shown in FIG. (E) and a partial route (1-4, 2-5) as shown in FIG. As a result of the comparison, the partial route (1
Since the set of (−2, 4-5) has a higher evaluation value, this is adopted and the set of partial paths (1-4, 2-5) is deleted from the selection candidates.

Subsequently, similarly, a partial route (2-3, 4-5) as shown in FIG. 9G and a partial route (2-4, 3-5) as shown in FIG. As a result of the comparison, the set of the partial paths (2-4, 3-5) has a higher evaluation value, so this is adopted and the set of the partial paths (2-3, 4-5) is deleted from the selection candidates. .

As a result of comparing all the partial paths in this way, an optimal screen-ordered path as shown in FIG. 9I is determined from the remaining partial paths.

[0110]

According to the above-mentioned invention, since there are screen divisions at the time of correction teaching and screen divisions at the time of actual board inspection, different screen divisions are used for the correction teaching work and the actual board inspection work. Each operation can be performed.

For this reason, in the teaching work, parts are prevented from entering into one screen in a complicated manner, and this work is efficiently performed. On the other hand, in the inspection, the tact time is reduced without considering the correction teaching work. You can give priority.

Therefore, it is possible to simultaneously reduce the burden of the operator's correction teaching work and shorten the inspection time.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a mounting board inspection apparatus according to the present invention.

FIG. 2 is a view showing a specific example of a printed circuit board on which components are mounted.

FIG. 3 is a schematic diagram illustrating a configuration of a light projecting unit and an imaging unit illustrated in FIG. 1;

FIG. 4 is an explanatory diagram of component type data stored in a component type table in FIG. 1;

FIG. 5 is an explanatory diagram for explaining screen layout of a printed circuit board and ordering of screens.

FIG. 6 is a flowchart illustrating an initial teaching process.

FIG. 7 is a flowchart illustrating a correction teaching process.

FIG. 8 is a flowchart illustrating a control information conversion process.

FIG. 9 is a flowchart showing an initial solution determination process.

FIG. 10 is an explanatory diagram specifically describing an initial solution determination process.

FIG. 11 is a flowchart illustrating a screen optimization process.

FIG. 12 is an explanatory diagram specifically explaining a screen optimization process;

FIG. 13 is a flowchart illustrating a screen ordering process.

FIG. 14 is an explanatory diagram specifically explaining a screen ordering process;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 XY table device 2 light emitting unit 3 imaging unit 4 control processing unit 10 printed board 41 control unit 42 image memory 43 component type table 44 memory 45 A / D conversion unit 46 soldering part detection unit 47 determination unit 48 mounting information conversion unit 49 control information conversion unit 50 teaching data conversion unit 51 XY table controller 52 keyboard 53 display unit 54 printer 55 floppy disk device

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01N 21/84-21/958 G06T 1/00-9/40

Claims (9)

(57) [Claims] 1. Teaching data for mounting board inspection having mounting information including a position, a component type, a size, and the like of a component on a mounting board is formed in advance, and correction teaching of the teaching data for mounting board inspection and the correction teaching are performed. In a mounting board inspection apparatus which requires screen splitting when inspecting a mounting board by using a first screen splitting forming means for forming a screen splitting required at the time of the correction teaching, the mounting board A second screen split forming means for forming a screen split required when inspecting a printed circuit board. 2. The first screen layout forming means, comprising: a first screen initial solution setting means for setting an initial solution of a screen layout required at the time of the correction teaching from the mounting information; First screen optimal solution setting means for setting an optimal solution from the initial screen division solution set by the screen initial solution setting means; and imaging based on the optimal solution set by the first screen optimal solution setting means. 2. The mounting board inspection apparatus according to claim 1, further comprising: first screen ordering setting means for setting the ordering of the screens to minimize the moving distance. A second screen initial solution setting unit configured to set an initial solution of a screen allocation required when inspecting the mounting board based on the mounting information; A second screen optimal solution setting means for setting an optimal solution from the initial screen splitting solution set by the second screen initial solution setting means; and an optimal solution set by the second screen optimal solution setting means. 2. The mounting board inspection apparatus according to claim 1, further comprising: second screen order setting means for setting an order of screens for minimizing an imaging movement distance. 4. The first screen initial solution setting means, based on the mounting information of the component to be inspected, first searching means for searching for a screen including the component to be inspected in an imaging range; Move the screen searched by the search means as appropriate,
First initial solution determination means for determining whether there is a component that can be covered simultaneously with the inspection target component; and a component that can be covered by the first initial solution determination device simultaneously with the inspection target component. If it is determined that there is a component, the position of the screen searched by the first search unit is changed to a position that can be covered simultaneously with the inspection target component, while a component that can be covered simultaneously with the inspection target component is changed. 3. The mounting board inspection apparatus according to claim 2, further comprising: a first screen updating unit that sets an original screen position when it is determined that the image does not exist. 5. A second screen initial solution setting means, comprising: a second search means for searching a screen including the inspection target component in an imaging range based on the mounting information of the inspection target component; Move the screen searched by the search means as appropriate,
Second initial solution determination means for determining whether there is a component that can be covered simultaneously with the inspection target component; and a component that can be covered simultaneously with the inspection target component by the second initial solution determination means. If it is determined that there is a component, the position of the screen searched by the second search means is changed to a position that can be covered simultaneously with the inspection target component, while a component that can be covered simultaneously with the inspection target component is changed. 4. The mounting board inspection apparatus according to claim 3, further comprising: a third screen updating unit that sets an original screen position when it is determined that there is no image. 6. The first screen optimum solution setting means reads one reference screen from the initial solution and searches the initial solution for a screen at least partially included in a predetermined range from the reference screen. A value obtained by adding the number of components covered by the screens to the total number of screens searched by the first screen search means and the first screen search means. A first evaluation value calculation unit as an evaluation value; and a screen searched by the reference screen and the first screen search unit in ascending order of the evaluation values calculated by the first evaluation value calculation unit. First optimal solution determining means for determining whether or not all the components within can be covered by one screen; and the first optimal solution determining means comprises:
If it is determined that all the components in the screen searched by the screen search means are covered by one screen, the reference screen and the screen searched by the first screen search means are deleted from the initial solution. Newly adding the positions of the screen covering all the components in the reference screen and the screen searched by the first screen search means to the initial solution, and ending the processing of the first optimum solution determination means. On the other hand, if it is determined that the screen cannot be covered by one screen, the instruction to perform processing of the value obtained by reducing the evaluation value by one without changing the reference screen position of the initial solution is given. 3. The mounting inspection apparatus according to claim 2, further comprising first initial solution updating means for outputting to the first optimal solution determining means. 7. The second screen optimum solution setting means reads one reference screen from the initial solution and searches the initial solution for a screen which is at least partially included in a predetermined range from the reference screen. A second screen search unit, and a total number of screens searched by the second screen search unit as an evaluation value for obtaining the optimal solution from the initial solution.
Evaluation value calculation means, and all components in the screen searched by the reference screen and the second screen search means in ascending order of the evaluation values calculated by the second evaluation value calculation means. Optimal solution determining means for determining whether or not the image can be covered by one screen, and the second optimal solution determining means comprises:
If it is determined that all the parts in the screen searched by the screen search means are covered by one screen, the reference screen and the screen searched by the second screen search means are deleted from the initial solution. Newly adding the positions of the screen covering all the components in the screen searched by the reference screen and the second screen searching means to the initial solution, and ending the processing of the second optimum solution determining means. On the other hand, if it is determined that the screen cannot be covered by one screen, the instruction to perform processing of the value obtained by reducing the evaluation value by one without changing the reference screen position of the initial solution is given. 4. The mounting inspection apparatus according to claim 3, further comprising a second initial solution updating unit that outputs to the second optimum solution determining unit. 8. The first screen ordering means selects two partial paths that do not connect the same screen from among partial paths connecting the screens of the screens indicated by the optimal solution, and selects a set of partial paths. First partial path selecting means for forming a path set; and, of two different partial path sets formed by the first partial path selecting means, a partial path set having a shorter component path length is preferentially left. 3. The mounting board inspection apparatus according to claim 2, further comprising: a first path selection information deletion unit that deletes another group from the path selection candidates. 9. The screen ordering means according to claim 2, wherein, of the partial paths connecting the screens indicated by the optimal solution, two partial paths not connecting the same screen are selected, and a set of partial paths is selected. A second partial path selecting means for forming a path set; and a partial path set having a shorter component path length is preferentially left among two different partial path sets formed by the second partial path selecting means. 4. The mounting board inspection apparatus according to claim 3, further comprising a second path selection information deleting unit that deletes another group from the path selection candidates.