JPH05251898A - Parts deciding method of electronic parts mounting machine - Google Patents

Abstract

PURPOSE:To improve an accuracy for evaluating a parts and improve a quality of the board of a product, by accumulating the data of the parts which are obtained by recognizing the parts, and by setting the allowable value of the data of the parts on the basis of the accumulated data, and further, by updating it. CONSTITUTION:The external shape of a parts is recognized by a visual recognition, and from the binary picture thereof the dimension of the parts is calculated. Then, whether the dimension of the parts is within the allowable value which is set in the last time or not is decided. When it is within the allowable value, after setting the effect that the mounting operation of the parts is performed, from the outside dimension of the parts, the average value thereof, which is inherent in each parts, is calculated. Then, the dispersion to the catalog dimension of the parts is calculated from the difference between the outside dimension and the catalog dimension of the parts. Further, from the calculated dispersion, the allowable value inherent in each parts, which satisfies an elimination given beforehand, is set, and it is updated in succession. Using the allowable value set in this manner as a deciding reference, whether the external shape of the parts is suitable or not is decided in the next time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for appropriately determining a component in a component recognition process of an electronic component mounter that recognizes and determines a component and mounts the component.

[0002]

2. Description of the Related Art In recent years, in the field of electronic component mounting, it has been required to reduce the size of components and increase the variety of products as well as to improve the quality of product boards. Electronic component mounters are being used.

The component evaluation process in the conventional recognition process of the electronic component mounter will be described below with reference to FIG. In FIG. 3, the outer shape of the currently recognized component is first recognized (step # 31), and then the previously stored outer shape of the component is compared with the outer shape of the currently recognized component to identify the currently recognized component. It is determined whether the outer shape is within the allowable value (steps # 32, # 33), and if it is within the allowable value, the mounting operation is set (step # 34). If it is not within the allowable value, the mounting operation is performed. It is set not to be performed (Step # 3)
5).

To further explain a specific example, the outer shape data of all parts are stored in advance by being divided into several types of patterns according to their types, and in the step of recognizing the outer shape of a part, the dimension, area, or number of leads of the part is obtained. Then, in the comparison step, a ratio with the previously stored outer shape data value is obtained, and it is determined whether or not the mounting operation is performed depending on whether or not the ratio is within an allowable value set for each pattern in advance.

[0005]

However, in the above-described processing, since the allowable value is fixedly set for each component, there is a difference in the component outer shape accuracy between manufacturers even for the same type of component. Since the recognition value fluctuates due to the temporal change of the illumination condition, it is necessary to expand the allowable range in consideration of these and set the accuracy, which deteriorates the accuracy of component evaluation. As a result, there is a problem in that it may be possible to mount even if the specified component is different.

In view of the above-mentioned conventional problems, the present invention provides a component determination method for an electronic component mounter capable of setting and updating a component allowable value based on recognition data for each component. The purpose is to

[0007]

According to a method of determining a component of an electronic component mounter of the present invention, in an electronic component mounter in which component data obtained by recognizing a component is mounted within a permissible value, It is characterized by including a process of accumulating the component data obtained by recognizing the component and a process of setting an allowable value of the component data based on the accumulated component data.

Preferably, the process of setting the allowable value is a process of obtaining a variation of the component data from a difference between each component data and the preset component data, and a process of giving a variation peculiar to each component in advance from the variation of the component data. And a process of setting and updating a permissible value satisfying the specified condition.

[0009]

According to the present invention, the component data obtained by the component recognition is stored, and the allowable value of the component data is set based on the stored data.
Since we will update it, even if there is a difference in the external shape accuracy of the parts between manufacturers or the lighting conditions change with time, we will improve the accuracy of part evaluation and mount only the parts within the appropriate tolerance range. It is possible to avoid mounting non-parts and improve the quality of the product board.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A component mounting operation in an electronic component mounting machine according to an embodiment of the present invention will be described below with reference to FIGS.

First, the component mounting operation will be described with reference to FIG. 2. After selecting a mounting nozzle suitable for the mounting component, the nozzle number is confirmed, and the mounting nozzle is further rotated to return to its original position. (Step #
11-13). Next, the component is sucked by the mounting nozzle (step # 14), and the component thickness is measured from the position of the mounting nozzle at the time of suction (step # 15). Next, the outer shape of the component is recognized by visual recognition (step # 16),
It is determined whether or not mounting is to be performed depending on whether it is a proper part or a defective part (step # 17). In the case of a defective part, the process proceeds to step # 21, the defective part is discharged without mounting, and the process returns to step # 11. When mounting with the proper component, the mounting nozzle is rotated to correct the mounting angle, and then the mounting nozzle is lowered toward the substrate to mount the component (steps # 18 and 19), and the mounting nozzle after mounting the component. After returning to the origin (step # 20), the process returns to step # 11 and the above operations are repeated to sequentially mount the components.

Next, the specific processing of the above-mentioned component recognition (step # 16) will be described with reference to FIG.
In step 1, the outer shape of the component is visually recognized, and the component dimension is obtained from the binary image. Next, in step # 2, it is determined whether or not the component size is within the previously set allowable value. If it is within the allowable value, the process proceeds to step # 3 to set the mounting operation and then to step # 5. If it is not within the allowable value, the process proceeds to step # 4 to set the mounting operation not to be performed. After that, the process proceeds to step # 5. In step # 5, the average value of the external dimensions peculiar to each component is determined from the external dimensions of the component determined in step # 1. This average value is used as reference data, and is used to issue a command to the parts manufacturer or inspection process or a command to change the lighting conditions when the average value is significantly different from the catalog size of the parts stored in advance. To be done. Next, in step # 6, the variation with respect to the catalog size of the component is calculated from the difference between the component outer dimension obtained in step # 1 and the component catalog size. Then, in Step # 7, Step #
The permissible value peculiar to each component satisfying a given condition is set from the variations obtained in 5 and 6 and updated. Here, the preset condition is that σ is obtained from the variation data and the plus / minus 3σ of the catalog value is an allowable value. The allowable value set in this way is used as a criterion for determining the suitability of the next component outline.

As described above, according to this embodiment, the process of obtaining the variation of the outer shape from the difference with the catalog outer shape in step # 6, and the allowable value satisfying the predetermined condition peculiar to each part in step # 7 are set. By providing the processing for updating, it is possible to set the allowable value in consideration of the variation in both the external shape accuracy of the component and the binary image. In this way, it is possible to automatically set tolerances that are not affected by the manufacturing accuracy of the external shape of the component and the environmental change of the recognition device such as the illuminance change of the illumination, and as a result, improve the quality of the product board. You can

In the above embodiment, the component size is used as the component outer shape, but it may be the component area.

Further, the present invention can be applied not only to the outer shape of a component by visual recognition but also to data relating to other component characteristics.

[0016]

According to the present invention, the component data obtained by the component recognition as described above is stored, and the allowable value of the component data is set / updated based on the stored component data. Even if there is a difference in the external shape accuracy of parts or the lighting conditions change with time, improve the accuracy of part evaluation so that only parts within the appropriate tolerance range are mounted, and parts that are not so are not mounted. Therefore, the quality of the product substrate can be improved.

[Brief description of drawings]

FIG. 1 is a flowchart of component recognition processing in a component mounting operation according to an embodiment of the present invention.

FIG. 2 is a flowchart of a component mounting operation of the same embodiment.

FIG. 3 is a flowchart of a component recognition process in a component mounting operation of a conventional example.

Claims (2)

[Claims] 1. An electronic component mounter configured to mount only a component whose component data obtained by recognizing the component is within an allowable value, and a process of recognizing the component and storing the component data obtained. A component determination method for an electronic component mounter, comprising: a process of setting an allowable value of component data based on component data. 2. A process of setting an allowable value is a process of obtaining a variation of component data based on a difference between each component data and a preset component data, and a process of presetting peculiar to each component based on the variation of the component data. The component determination method for an electronic component mounter according to claim 1, further comprising: a process of setting and updating an allowable value satisfying a condition.