JP2943397B2 - Parts rotation inspection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component rotation inspection method for detecting the position and orientation of an electronic component in a visual recognition device used in electronic component mounting equipment for mounting an electronic component or the like at a predetermined position on an electronic circuit board. About.

[0002]

2. Description of the Related Art In an electronic component mounting facility for mounting an electronic component at a predetermined position on an electronic circuit board, when the electronic component is taken out from a component supply unit and transferred onto the electronic circuit board, the electronic component being transferred is removed. A method of detecting the position and orientation using a visual recognition device, positioning the electronic component, and mounting the electronic component in a non-contact and highly accurate manner is often used. The visual recognition method used in the electronic component mounting equipment includes a method of processing a contour image of the electronic component obtained by illuminating the electronic component from the background side and recognizing the position and orientation of the electronic component (hereinafter, a transmission illumination recognition method and a ), And a method of detecting the body and electrode images of the electronic component obtained by illuminating the electronic component from the front side and recognizing the position and orientation of the electronic component (hereinafter, referred to as a reflected illumination recognition method). The transmitted illumination recognition method has a limitation that an accurate contour image cannot be obtained for an electronic component smaller than the component holding unit for transferring the electronic component, and it is difficult to recognize the component. A recognition method that does not have this restriction is a reflected illumination recognition method.

FIG. 9 schematically shows a process of detecting an electrode image of an electronic component and recognizing the position and orientation of the electronic component in the reflected illumination recognition method. FIG. 9A shows an example of an image input unit based on the reflected illumination recognition method, and FIG. 9B shows an example of a process of detecting an electrode part image from a captured image and calculating the position and orientation of an electronic component. ing. In this case, the dimensions of the electronic component, the electrode direction, the number of electrodes, and the like necessary for recognition are given to the electronic component mounting equipment in advance.

[0004]

The above-described method for recognizing reflected illumination is applied to an electronic component having electrodes as shown in FIG.
FIG. 6 is an example of a type of electronic component usually called a SOT (small output transistor) component. SOT
The position and angle of the part are determined as shown in FIG. However, it is assumed that the electrode direction of the electronic component with respect to the image visual field is as given in advance. However, the fact that the conditions continue to be 100% satisfied in the actual equipment means that the maintenance status of the equipment, electronic component setting errors,
Or it may be difficult due to factors such as data entry errors. If the condition is not satisfied for some reason, the recognition of the position and angle of the SOT component will be erroneous. FIG. 8 is a diagram showing an example thereof. In the case of FIG. 8, the position of the electrode part image is detected, but the positional relationship is processed according to the electrode direction given in advance, so that the position and angle of the electronic component are erroneously recognized. In order to prevent this error, there is usually a method of using data such as the distance between each electrode or the size of each electrode portion. However, since electronic components can be of various dimensions, the distance between the electrodes or the dimensions of the electrode portions may be equal, which is not a general solution.

In addition, in order to detect an error, data such as the distance between each electrode and the dimensions of each electrode portion must be added and given to the electronic component mounter in advance. The probability of occurrence of an input error increases.

An object of the present invention is to solve the above-mentioned problems and to provide a component rotation inspection method capable of obtaining a correct electronic component angle.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an electronic component having a plurality of rectangular electrode portions.
An image detecting step for detecting the all electrodes of the electronic component
The electrode direction data given in advance
Calculating the position angle of the electronic component by using
The linear part of each output electrode part is detected, and among these linear parts,
The angle formed with respect to the previously given electrode direction is 4
Adopt straight line detection that is within 5 degrees
The adoption process and the straight line portion adopted in the straight line portion detection adoption process
With reference to the previously given electrode direction.
Calculating the angle of the straight line portion, and calculating the component angle
Calculating the angle of the electronic component obtained in the step and the angle of the linear portion
Compare the angle of the linear part of the electrode part obtained in
Normal if within the predetermined angle difference, otherwise
A component rotation inspection method including a determination step of determining false recognition
I will provide a.

[0008]

According to the present invention, the image of an electronic component having a rectangular electrode portion has the above configuration, and the position of each electrode portion, the angle of the electronic component obtained from a predetermined electrode portion direction, and each electrode The angle of the electronic component obtained by comparing the angle formed by the straight portion of the part with the electrode direction given in advance and determining that the angle difference is within the predetermined angle difference is the correct angle. Is detected, it is not necessary to use additional data such as a difference in the distance between the electrodes or a difference in the size of each electrode portion, and it is possible to detect the presence or absence of an error in the recognition angle using only conventional data.

[0009]

(Embodiment 1) A first embodiment of a component rotation inspection method according to the present invention will be described below. FIG. 1 shows a flowchart of the component rotation inspection method of the present invention, FIG. 2 shows an error detection process by the component rotation detection method of the present invention, and FIG. 3 shows a normal recognition process by the component rotation detection method of the present invention. In the present invention, first, the position of each electrode portion is detected from the image of the electronic component as in the related art,
The angle of the electronic component is obtained using the electrode part direction given in advance (F-1). Next, a straight line portion of each of the detected electrode portions is detected, and an angle formed by the straight line portion with reference to a predetermined electrode portion direction is obtained (F-2).
Since the electrode portion has a rectangular shape, the electrode portion has four sides per one electrode portion. Of the four sides, the one whose absolute value of the angle with respect to the electrode part direction given in advance is within 45 degrees is adopted. The finally detected angle of the electronic component is compared with the angle obtained from the linear portion of the electrode portion (F-3), and it is determined that the angle difference is within a predetermined angle difference. (F-4). If the angle difference exceeds a predetermined angle difference, it is determined that the detected angle of the electronic component is incorrect (F-5).

FIG. 4 shows an example in which the component rotation inspection method of the present invention is applied, and FIG. 4A shows a direction of a predetermined electrode portion (normal electronic component angle) of an electronic component. FIGS. 4B to 4E show the determination results according to the present invention when the electronic component is rotated and is present in the image field of view. FIG. 4B shows +180 compared to the normal state.
In the case of rotation in the degree direction, it is determined that the electronic component angle θb obtained as can be seen from the drawing is incorrect. FIG. 4C shows a case where the electronic component is rotated in the −90 degree direction as compared with the normal order, but it is determined that the electronic component angle θc obtained as shown in the drawing is incorrect. FIG. 4D shows the case of the same direction (normal direction), and it is determined that the electronic component angle θd obtained as shown in the figure is normal. FIG. 4 (e)
Is the case where it is rotated in the +90 degree direction compared to the normal state,
As can be seen from the figure, it is determined that the electronic component angle θe obtained is incorrect. As shown in the figure, it can be seen that the component rotation inspection method of the present invention is correct.

(Embodiment 2) A second embodiment of the component rotation inspection method according to the present invention will be described with reference to FIG. In the example of FIG. 5, when the determination result of the present invention is NG, the direction of the electrode portion given in advance is changed to the other three types, and the inspection is retried in order until the determination result becomes OK. If a retry as shown in FIG. 5 is performed, a correct electronic component angle can be obtained without any data on the direction of the electrode part.

As described above, according to the component rotation inspection method of the embodiment of the present invention, in the image of the electronic component having the rectangular electrodes, the electronic component having the electronic component obtained from the position of each electrode and the electrode direction given in advance. The angle of the electronic component obtained by comparing the angle with the angle formed by the straight line portion of each electrode with respect to the electrode direction given in advance and determining that the angle difference is within the predetermined angle difference is correct. Is detected, a correct electronic component angle can be obtained.

[0013]

As is apparent from the above embodiments, according to the present invention, in recognizing the position / posture of an SOT component or an electronic component having a similar electrode part positional relationship,
If the electrode part is located in a direction different from the electrode part direction given in advance without using inspection data, the correct electronic part angle can be obtained without recognizing the wrong electronic part angle. When used in electronic component mounting equipment, a component rotation inspection method in which electronic components are mounted with high accuracy can be provided.

[Brief description of the drawings]

FIG. 1 is a flowchart of a component rotation inspection method according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing an erroneous recognition determination process according to the method.

FIG. 3 is a schematic diagram showing a normal recognition determination process by the same method.

FIG. 4 is a schematic diagram showing a determination result by the same method.

FIG. 5 is a schematic diagram illustrating a component rotation inspection method according to a second embodiment of the present invention.

FIG. 6 is an external view of an electronic component to which the present invention is applied.

FIG. 7 is a schematic diagram showing a process of detecting the position and angle of the electronic component shown in FIG. 6;

FIG. 8 is a schematic diagram illustrating erroneous recognition in a conventional recognition method.

FIG. 9 is a schematic diagram illustrating a method for recognizing a reflected illumination component.

────────────────────────────────────────────────── ─── Continued on the front page (72) Takashi Shimizu, Inventor 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-2-250730 (JP, A) JP-A-1- 155202 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) H05K 13/08

Claims (2)

(57) [Claims] 1. An electronic component having a plurality of rectangular electrode portions, the position of each electrode portion is determined from a position image of the electronic component.
An image detecting step for detecting the all electrodes of the electronic component
The electrode portion direction of the data given in advance in part
Calculating the position angle of the electronic component by using
The linear part of each output electrode part is detected, and among these linear parts,
The angle formed with respect to the previously given electrode direction is 4
Adopt straight line detection that is within 5 degrees
The adoption process and the straight line portion adopted in the straight line portion detection adoption process
With reference to the previously given electrode direction.
Calculating the angle of the straight line portion, and calculating the component angle
Calculating the angle of the electronic component obtained in the step and the angle of the linear portion
In comparing the angle of the straight portions of the electrode portions obtained, normal if Re der within angular difference that angle difference <br/> predetermined, if not
A component rotation inspection method comprising: a determination step of determining erroneous recognition . 2. If it is determined in the determining step that the recognition is erroneous, the direction of the electrode portion given in advance is changed by 90 degrees, and a linear portion detection adopting step, a linear portion angle calculating step, and a determining step are performed. 2. The component rotation inspection method according to claim 1, wherein the inspection is sequentially retried until the determination is made.