JP2002299900A - Mounting component inspection method and device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a mounting board inspection method capable of inspecting the appearance of a mounting board on which a plurality of types of parts purchased by multiple companies are mounted without replacing the board inspection data. SOLUTION: When performing an appearance inspection of a plurality of types of components having the same characteristics but different appearances at the same position on a substrate, component inspection reference data only for the type of the component is stored in a storage unit in advance. When performing a component inspection at a position where a plurality of types of components are mounted, the type of the component to be inspected is determined, and the component inspection reference data corresponding to the component is stored in the storage unit. The inspection is performed by selecting from the part inspection data of the above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting the appearance of components mounted on a circuit board, and more particularly to a method of mounting a plurality of types of components having the same characteristics but different appearances at the same position on a plurality of boards. The present invention relates to a method and an apparatus for inspecting a mounted component which does not require replacement of component inspection data when the device is installed.

[0002]

2. Description of the Related Art In recent years, in mass production, it has become difficult to stably purchase parts from the same parts manufacturer. Therefore, multi-company purchasing, in which parts having the same characteristics are purchased from a plurality of parts manufacturers, is widely adopted so that parts can be purchased at a slightly lower price while avoiding shortage of delivery time and quantity. In this way, when parts are mounted using parts purchased from multiple parts manufacturers using the multi-company purchasing method, even if the characteristics are the same, due to differences in appearance such as differences in polarity marks, differences in external dimensions, etc. Therefore, it has become difficult to perform an inspection using the same component inspection data in the appearance inspection of a mounted component. Therefore, component inspection data corresponding to the types of parts purchased from multiple component manufacturers is created in advance for each type, and when mounting components on the board, the board inspection data is converted by Inspection was performed after changing to the part inspection data corresponding to.

[0003]

However, if there are many types of purchased parts and the replacement is intense, every time the parts are replaced and mounted on the board, the inspection device is stopped to match the parts mounted with the board inspection data. Must be changed to part inspection data. Therefore, if there are many types of purchased parts and their replacement is frequently performed, unnecessary time for a process change is generated, and a change in board inspection data is liable to occur.

When a plurality of types of purchased parts are mounted at a plurality of positions on a plurality of boards, the number of combinations increases, and it is necessary to prepare board inspection data for the number of combinations. It takes time and effort. For example,
When 10 component types are mounted at the mounting position A, 5 component types are mounted at the mounting position B, and 2 component types are mounted at the mounting position C, the number of combinations is as many as 10 × 5 × 2 = 100. .

According to the present invention, even when there are many types of purchased parts, the inspection is performed using a plurality of types of component inspection data stored in the storage means, so that the board inspection data does not need to be replaced. An object of the present invention is to provide a visual inspection method and an apparatus for the method.

[0006]

According to the present invention, there is provided a method for inspecting a mounted component in which a plurality of types of components having the same characteristics but different appearances are mounted at the same corresponding positions on a plurality of substrates. A method of storing component inspection data corresponding to each type of the plurality of types of components in a storage unit in advance, and determining the number of types of components to be inspected at a mounted position based on the component inspection data. A number-of-types determining step, a feature-amount extracting step of extracting a feature amount of the appearance of the inspection-target part, a type-determining step of determining the type of the part based on the characteristic amount of the inspection-target part, and A step of selecting component inspection data matching the type from the storage means and performing an appearance inspection based on the component inspection data.

According to this configuration, when inspecting a mounted board in which a plurality of types of parts having the same characteristics but different appearances are mounted at the same corresponding positions on a plurality of boards, a large number of pieces of board inspection data are stored in the storage means in advance. Parts inspection data for the number of types of parts purchased by the company are stored. Then, when inspecting the position where a plurality of types of components are mounted, first, the feature amount of the component is automatically determined, and the component inspection data suitable for the component is automatically selected based on the determined feature amount. Inspection of mounted components can be performed. As a result, even if the type (manufacturer) of the component mounted at the same position changes, it is not necessary to replace the board inspection data, and the troublesome work of temporarily stopping the inspection device or replacing the board inspection data is eliminated. And mistakes can be prevented.

In the mounted component inspection method having the above configuration, when sequentially inspecting a plurality of substrates, the inspection of the nth and subsequent substrates uses the component inspection data selected in the inspection of the (n-1) th substrate. In the case where a defect is determined as a result of the inspection, the feature amount extracting step and the type determining step are performed, and component inspection data that matches the type of the determined inspection target component is selected to perform the inspection. It is preferred to do so. Since there is almost no difference in the types of components mounted on each sheet, it is possible to omit the feature amount extraction step and the type determination step for the nth and subsequent sheets.

A method for inspecting a mounted component according to another aspect of the present invention is an inspection method for inspecting the appearance of components in which a plurality of types of components having the same characteristics but different appearances are mounted at the same corresponding positions on a plurality of substrates. Storing the component inspection data corresponding to each type of the plurality of types of components in a storage unit in advance; and determining the number of types of the component to be inspected at a mounted position based on the component inspection data. Discriminating step, a step of sequentially inspecting the inspection target component using a plurality of types of component inspection data when inspecting the inspection target component at a position where the plurality of types of components are mounted, and each component A quality determining step of determining the quality of the inspection target component from the inspection result based on the inspection data;

According to this configuration, since the inspection is performed sequentially using a plurality of types of component inspection data, the subsequent inspection can be omitted when a non-defective product is obtained. In addition, a type discrimination step by extracting a feature amount can be omitted. In the mounted component inspection method having the above-described configuration, it is preferable that in the pass / fail determination step, a predetermined weight is applied to the inspection result based on the respective component inspection data, and the pass / fail of the inspection target component is determined from the weighted inspection result. As a result, it is possible to reduce the discrimination error that occurs when discriminating the type of the component, and it is possible to further improve the inspection accuracy. In addition, a feature amount extraction step is added to this inspection method to (1) increase the weight of the inspection result of the component determined by the feature amount extraction, or (2) or increase the degree of correlation with the feature amount. By changing the weight of the inspection result of the component, the inspection accuracy can be further improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the mounted component inspection method according to the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIG. 1 is a block diagram showing a configuration of a mounted board appearance inspection apparatus by a mounted component inspection method according to Embodiment 1 of the present invention. In FIG. 1, components A 11, component B 12, component C 13, and component D 14 are mounted at four locations on a mounting board 2, and are respectively measured by the appearance measurement sensor 1 that is moved by a moving mechanism (not shown). , The sensor 1 outputs measurement data 3. In the case of the first embodiment, the component A 11 mounted on the mounting board 2 is 4
(Ap, Aq, Ar, As), and four types of components A11 are mounted on the mounting board 2. The component D is a purchased component from two companies (Dp and Dq), and two types of components D14 are mounted on the mounting board 2. Parts B and C are each one company (B
(Company p, Company Cp), and the same type of component B12 and component C13 are mounted on each board.

On the other hand, a plurality of types of components A 11 to 11 to be mounted
D14 corresponding to each component inspection data (11a
14b) are stored in advance in the storage device 5 as the board inspection data 4.
To memorize. The number-of-types determining unit 6a determines the number of types of components mounted at respective positions on the board from the board inspection data 4 stored in the storage device 5. If there are a plurality of types of discriminated parts, the feature amount extraction unit 6
b extracts a feature amount from measurement data 3 such as dimensions and brightness measured by the appearance measurement sensor 1. Also, a type discriminating unit 6
c compares the feature quantity extracted by the feature quantity extraction unit 6b with the respective component inspection reference data in the board inspection data 4 to determine the type of the component to be inspected. The inspection unit 7
From the board inspection data 4, the reference data for component inspection corresponding to the type of the component to be inspected is compared with the measurement data 3, and the quality is determined to obtain an inspection result 8.

FIG. 2 is a block diagram showing the structure of the board inspection data 4 stored in the storage device 5 in the mounted component inspection method according to the first embodiment. The four types of component inspection data 11a to 11d of the component A and the two types of component inspection data 14a to 14b of the component D include respective suppliers (Ap.
Dq) stores a plurality of data representing the feature values of parts and data corresponding to inspection items. These feature amount data are, for example, reflected light data from the component surface, label print data, polarity mark type data, component height data, and the like.

Next, referring to the flowchart of FIG.
A mounting component inspection method according to the first embodiment will be described. As shown in FIG. 3, in step S <b> 1, a part inspection component including the feature amounts of the four parts A, 1 part B, 1 part C, and 2 parts D used is used. The reference data 11a to 14b are extracted and stored in the storage device 5.
In step S2, it is determined whether the components A to D mounted on the board are purchased from a plurality of companies. This determination is performed using the number of the component inspection reference data 11a to 11d contained in the board inspection data of the component A, for example. In step S3, components not purchased from a plurality of companies, such as component B and component C, are inspected using one type of component inspection data 12a and 13a, respectively, and a determination result is output.

In step S3, in the case of parts purchased from a plurality of companies, such as part A and part D, the feature quantity of the part to be inspected is extracted from the measured appearance data 3 shown in FIG.
These feature amounts are compared with the feature amount data contained in the respective component inspection data 11a to 14b in step S4, and it is determined which component the component belongs to. In the type determining step S5, the determined type of component inspection data is extracted. In the component inspection step S6, an inspection is performed using the extracted component inspection data, and the inspection result is output.

As described above, according to the inspection method of the first embodiment, the type of the mounted component is determined based on the feature amount data, and the type is determined from the board inspection data stored in the storage device 5 (FIG. 1). It is possible to select and inspect various types of component inspection data. As a result, it is not necessary to replace the component inspection data suitable for the type of the mounted component as the board inspection data, and it is not necessary to temporarily stop the inspection device. Therefore, the inspection time can be shortened, and complicated operations and mistakes when replacing the substrate inspection data can be prevented.

When sequentially inspecting a plurality of boards in the mounted component inspection method of the first embodiment, first, feature amounts are extracted in the first board inspection. In the subsequent board inspection for the second and subsequent boards, the board is inspected using the component inspection data extracted for the first board. In such an inspection method, it is preferable to extract the characteristic amount only when the inspection result becomes defective, and to use the component inspection reference data suitable for the characteristic amount. By doing so, it is possible to shorten the time spent for feature amount extraction and further reduce the inspection time.

In this case, if the component inspection data determined by performing the feature extraction is the same as the first component inspection data,
By determining the defect without performing the reinspection, the inspection time can be further reduced. Since the types of parts purchased from a plurality of manufacturers are not usually changed for each board, the inspection time can be shortened by omitting the feature quantity extraction.

Embodiment 2 FIG. 4 is a flow chart of a method for inspecting a mounted component according to a second embodiment of the present invention. The second embodiment is different from the first embodiment only in the flow of inspection after the step of determining that a part is purchased from a plurality of companies. Therefore, a duplicate description of the same parts as those in the first embodiment in FIGS. 1 to 3 will be omitted. As shown in FIG. 4, in the mounted component inspection method according to the second embodiment, in step S6, in the case of purchased components from a plurality of companies, the component inspection data 11a to 11a to 11 stored in advance in the storage device 5 as board inspection data. The inspection of steps S6a to S6d is performed by using 11d sequentially. Here, for example, if a non-defective product is inspected using the Ap component inspection data 11a, the mounted component is determined to be acceptable as the Ap component A.

As described above, when it is determined that at least one component inspection data 11a is a non-defective product, the inspection result of the component to be inspected is passed, and the subsequent component inspection data 1a.
The inspection in Steps 6a to 6d using 1b to 11d can be omitted. As a result, the inspection time can be reduced. In addition, since the feature amount is not extracted, the time spent on the steps of extracting the feature amount and determining the component inspection data can be omitted.

In the mounted component inspection method according to the second embodiment shown in FIG. 4, as a method for comprehensively judging from the inspection results based on the respective component inspection data, weighting is performed on the inspection results by a weighting unit 9 shown by a dotted line in FIG. There is a way to do that.
As a weighting method, for example, there is a method of extracting a characteristic amount from measurement data and increasing the weight of an inspection result based on component inspection data determined based on the characteristic amount. Specifically, as shown in FIG. 2, if the type of the component determined from the reflected light data from the component surface extracted from the measurement data of the component A is that of Aq, the inspection result based on the component inspection data 11b The weight of.

As another weighting method, a correlation is obtained by comparing a characteristic amount extracted from the measured data with a characteristic amount of each part inspection data, and the correlation is determined according to the strength of the correlation. There is a method of weighting the inspection result based on the component inspection data. Specifically, when the reflected light data from the component surface extracted from the measurement data of the component A has a strong correlation with that of the Ar company in the reflected light data of the respective component inspection data 11a to 11d, The weight of the inspection result based on the component inspection data 11c is increased. As a result, it is possible to reduce a discrimination error generated when discriminating the type of the component based on the feature amount, and it is possible to further improve the inspection accuracy.

<< Embodiment 3 >> The mounting component inspection method of Embodiment 3 takes into account the inspection time, the number of types of parts purchased by multiple companies, and the inspection accuracy. This is a method for setting which of the mounting board inspection methods of Example 2 is to be used. This makes it possible to carry out an inspection that is optimal for the inspection of the mounting board. For example, when the type of a multi-company purchased part used on the day is known, the inspection time can be shortened and the inspection accuracy can be improved by previously determining the unused part inspection data.

[0025]

As described in detail in the above embodiments, in the inspection of a board in which a plurality of kinds of purchased parts are mounted on a plurality of boards, replacement of different kinds of parts by different parts manufacturers has occurred. Even in this case, the mounted board can be inspected without replacing the board inspection data. As a result, it is possible to eliminate a time loss occurring at the time of replacing the board inspection data and a mistake in replacing the board inspection data, thereby enabling a highly efficient and accurate inspection.

[Brief description of the drawings]

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

FIG. 2 is a block diagram illustrating a configuration of board inspection data according to the first embodiment.

FIG. 3 is a flowchart of a mounting board inspection method according to the first embodiment of the present invention.

FIG. 4 is a flowchart of a mounting board inspection method according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Appearance measurement sensor 2 Mounting board 3 Measurement data 4 Board inspection data 5 Storage device 6a Type number discriminating unit 6b Feature amount extracting unit 6c Type discriminating unit 7 Inspection unit 9 Weighting unit 11 Part A 11a Part inspection data of Ap company 11b Aq company Part inspection data 11c Ar company's inspection data 11d As company's inspection data 12 Part B 12a Bp's inspection data 13 Component C 13a Cp's inspection data 14 Component D 14a Dp's inspection data 14b Dq Parts inspection data

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Daisuke Nagai 8-1, Koshinmachi, Takamatsu City, Kagawa Prefecture

Claims (15)

[Claims] An inspection method for performing an appearance inspection of a component in which a plurality of types of components having the same characteristics but different appearances are mounted at the same corresponding positions on a plurality of substrates, wherein each of the plurality of types of components is previously determined. Storing the component inspection data corresponding to the type of the component in the storage means, determining the number of types of the component to be inspected at the mounted position based on the component inspection data, and distinguishing the appearance of the component to be inspected. A feature value extracting step of extracting a quantity; a type determining step of determining the type of the component based on the feature value of the component to be inspected; and component inspection data matching the determined type of the component to be inspected is selected from the storage unit. And a step of performing an appearance inspection based on the component inspection data. 2. The mounting component inspection method according to claim 1, wherein the characteristic amount of the appearance of the inspection target component is a difference amount of a light reflection amount depending on a surface state of the component. 3. The mounting component inspection method according to claim 1, wherein the feature amount of the appearance of the inspection target component is a difference amount of a pattern printed on a surface of the component. 4. The mounting component inspection method according to claim 1, wherein the feature amount of the appearance of the inspection target component is a difference amount of a display state of a polarity mark of the component. 5. The mounting component inspection method according to claim 1, wherein the characteristic amount of the appearance of the inspection target component is a difference in height dimension of the component. 6. In the case of sequentially inspecting a plurality of substrates, in the inspection of the nth and subsequent substrates, the inspection is performed using the component inspection data selected in the inspection of the (n-1) th substrate. When the defect is determined as a result, the characteristic amount extracting step and the type determining step are performed, and the inspection is performed by selecting the component inspection data that matches the type of the determined inspection target component. Item 1. The mounting component inspection method according to Item 1. 7. When the inspection target component on the n-th board is determined to be defective, when the type of the inspection target component determined to be defective is the same as the type of the corresponding component of the (n-1) th substrate 7. The mounting component inspection method according to claim 6, wherein a defect is determined without performing an inspection. 8. An inspection method for performing an appearance inspection of a component in which a plurality of types of components having the same characteristics but different appearances are mounted at the same corresponding positions on a plurality of substrates, wherein each of the plurality of types of components is previously determined. Storing the component inspection data corresponding to the type of the component in the storage unit; a type number determining step of determining the number of types of the inspection target component at the mounted position based on the component inspection data; A step of sequentially inspecting the inspection target component using a plurality of types of component inspection data when inspecting the inspection target component at the position where the inspection target component is located, and the inspection result of the inspection target component based on the inspection result based on the respective component inspection data. A method for inspecting a mounted component, comprising a pass / fail judgment step of judging pass / fail. 9. In the pass / fail determination step, among the inspection results based on the respective part inspection data,
9. The mounting component inspection method according to claim 8, wherein when at least one good inspection result is obtained, the inspection result of the inspection target component is determined as a non-defective product. 10. The quality determination step, wherein a predetermined weight is applied to an inspection result based on the respective component inspection data, and the quality of the inspection target component is determined based on the weighted inspection result. The mounting component inspection method described. 11. The method according to claim 11, wherein the predetermined weighting is to extract feature amounts of the plurality of types of components and increase weight of an inspection result based on component inspection data selected based on the feature amounts. Claim 10
The mounting component inspection method described. 12. The method according to claim 1, wherein the predetermined weighting is to increase a weight of an inspection result based on component inspection data having a strong correlation between the feature amount extracted from the plurality of types and the feature amount of the component inspection data. The method for inspecting a mounted component according to claim 10. 13. The mounting component inspection method according to claim 1, wherein an inspection method is selected and performed for each inspection target component. 14. An apparatus for inspecting the appearance of a mounting board on which a plurality of types of inspected components having the same characteristics but different appearances are mounted at the same position on the substrate, wherein the inspected component has an external appearance and dimensions. An appearance measurement sensor for measuring, storage means for storing in advance respective component inspection data corresponding to the plurality of types of components, means for determining the number of types of the inspection target component based on the component inspection data, Means for extracting a feature amount from the measurement data measured by the appearance measurement sensor when there are a plurality of types of inspected parts determined, comparing the feature amount with the component inspection data stored in the storage means Means for determining the type of the inspection target component, and selecting the component inspection data corresponding to the determined type of the inspection target component from the storage unit, It mounted component inspection device, characterized in that it comprises a checking means for performing, based on the component inspection data inspection. 15. The mounting component inspection apparatus according to claim 14, further comprising a weighting unit that performs a predetermined weighting on an inspection result based on the respective component inspection data in the inspection unit.