JPH04219999A - Component mounting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component mounting machine used, for example, to mount predetermined electronic components at predetermined positions on an electronic circuit board.

0002

[Prior Art] In recent years, in the field of electronic circuit board manufacturing,
As products become smaller and more sophisticated, the mounting density of electronic components on electronic circuit boards increases, and the dimensions of the components to be mounted increase, for example, with reference to component 1 shown in FIG. 5, the planar dimension X× Y is as small as 0.5 mm x 1.0 mm. Furthermore, various shapes of parts are being used. Furthermore, efforts are being made to improve component mounting accuracy and reliability in electronic component mounting machines that mount components. One of the ways to improve component mounting accuracy is to image the component being transferred in the component transfer and mounting section, recognize the posture and positional deviation of the component holding section of the component transfer and mounting section, and adjust the mounting posture. There is also an image recognition means for instructing the necessary parts to correct the position. A typical image recognition means is shown in Figure 6 (a).
), the component 1 held in the component holder 11 is illuminated with illumination light 2 from behind on the component holder 11 side, and an image of the shadow of the component 1 is captured and recognized by the transmitted light. Recognition means A and reflected illumination recognition that illuminates the component 1 with illumination light 3 from the front, which is the side opposite to the component holding section, and captures and recognizes the electrode portion image 13 of the component 1, with reference to FIG. 6(b). There is a means B. Conventionally, one component mounting machine employs only one of the image recognition means A and B, and most employ the transmitted illumination recognition means A.

0003

[Problem to be solved by the invention] However, in the conventional component mounting machine that has only one type of image recognition means,
The accuracy and reliability of mounting various parts, as well as the ease of use of machines, are becoming increasingly difficult to meet.

For example, a component mounting machine equipped with transmitted illumination recognition means A recognizes images of the shadows of components, so it has considerable ability to handle components with simple shapes and variations in color and is reliable. As shown in FIG. 6(a), the image C of the component holder 11 cannot be obtained for the component 1 whose diameter is smaller than that of the component holder 11 where the diameter of the component transfer mounting section is 1.2 mm. However, it is not possible to obtain an image C' of the external shape of the part 1. For this reason, high mounting accuracy cannot be obtained. In addition, the component 4 which is a PLCC package shown in FIG. 7,
For components such as SOJ packages, in which the component electrodes are difficult to appear on the component outline, an image D of the shadow of the component 4 as shown in FIG. 8(a) can be obtained; The condition becomes difficult to recognize.

In addition, in a component mounting machine having a reflected illumination recognition means B, as shown in FIG. It is possible to clearly obtain E. However, since it is easy to mistakenly recognize an image portion resembling a component electrode portion as an electrode portion, it is not as reliable as the transmitted illumination recognition means A. Further, there is a problem that the parts are easily affected by the color of the parts, and if parts of the same type have different colors, it becomes necessary to treat them as different parts.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a component mounting machine that can solve the conventional problems by allowing the two types of recognition means to be used depending on the type of component. It is something.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a component supply section that supplies components to be mounted, and a mounting device that positions and holds an object to be mounted. An object positioning section, a component transfer and mounting section that transfers the components to be mounted from the component supply section onto the object to be mounted and mount them at a predetermined position on the object, and a component transfer and mounting section that transfers the components being transferred. The image is taken at a predetermined position, the posture and positional deviation of the component in the component holding section of the component transfer and mounting section is recognized, and the correction of the mounting posture and position is commanded to the required section, so that the component is placed in the predetermined position on the object to be mounted. an image recognition unit to be implemented in the above-mentioned component supply unit;
In a component mounting machine equipped with a control unit that controls operations of an object positioning unit, a component transfer and mounting unit, and an image recognition unit, the image recognition unit includes a component held by a component holding unit of the component transfer and mounting unit. Transmitted illumination recognition means that illuminates a part from the side of the component holder to capture and recognize an image of the component using transmitted light, and illuminates the component from the side opposite to the component holder to capture and recognize an image of the component using reflected light. The present invention is characterized in that a reflected illumination recognition means is provided, and the use of these two recognition means is switched by the control section depending on the type of component to be mounted.

[0008]

[Function] According to the above structure of the present invention, the control section switches between the transmitted illumination recognition means and the reflected illumination recognition means depending on the type of component to be mounted, so that it is possible to use a simple shape with a uniform color. By capturing an external image of the part using transmitted illumination recognition means, the orientation and positional deviation of the part can be appropriately recognized. In addition, parts that are smaller than the component holding section of the component transfer and mounting section,
For parts whose electrode parts are difficult to appear on the outside of the part, the posture and positional shift of the part can be properly recognized by capturing an image of the surface of the part on the side opposite to the part holding part by using a reflected illumination recognition means. I can do it.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing a component mounting machine as an embodiment of the present invention, and FIG. 2 is a block diagram. As can be seen from these figures, there are a component supply section 6 that supplies the component 1 and the like to be mounted, a board positioning section 8 that positions the electronic circuit board 7 on which the component 1 and the like are to be mounted;
A component transfer and mounting section 9 transfers and mounts the component 1 etc. from the component supply section 6 onto the positioned electronic circuit board 7; this component transfer and mounting section 9 transfers the component 1 etc. from the component supply section 6 to the electronic circuit board 7; 7
It has an image recognition unit 10 which is installed at a predetermined position during the transfer to the top and recognizes the posture and positional deviation of the component 1 etc. by imaging, and the operation of these units is controlled by the control unit 12. There is. The image recognition unit 10 is equipped with the above-mentioned transmitted illumination recognition means A and reflected illumination recognition means B, which are switched and used by the control unit 12 according to the type of component 1 etc. to be mounted. It has become. Image recognition unit 10 having each of these recognition means A and B
is schematically shown in FIG.

The component supply section 6 delivers components 1 and 4 indicated by the mounting data inputted in advance to the control section 12 to the component transfer and mounting section 9. The component transfer mounting section 9 is the component holding section 1
1, the part 1, etc. is received and moved to the part image input section of the image recognition section 10. At this time, the control unit 12 selects transmitted illumination recognition means A or reflected illumination recognition means B depending on the mounting data.
Either one is valid. When the transmitted illumination recognition means A becomes effective, the illumination light source 21 emits light, and the illumination light 2 is reflected by the reflection plate 22 to illuminate the component 1 etc. at the tip of the component holder 11 from behind on the component holder 11 side. .

The transmitted illumination recognition means A uses the television camera 24 to capture an image of the shadow of the component 1 etc. caused by the illumination using transmitted light, and determines the posture of the component holder 11 and the component 1 etc.
Recognize misalignment. Therefore, according to this recognition method, the external shape of the component 1 etc. can be recognized properly on the condition that it is larger than the component holding part 11, and the influence of color variations of the component 1 etc. is not affected. Hateful.

Furthermore, when the reflected illumination recognition means B becomes effective,
The illumination light source 23 emits light and illuminates the lower surface of the component 1 etc. with the illumination light 3. At this time, the reflected illumination recognition means B uses the television camera 24 to capture the electrode part images E and F by the reflected light from the lower surface of the component 1 etc., and recognizes the posture and positional deviation of the component holder 11 and the component 1. Therefore, with this recognition method, even if the component 1 is smaller than the component holding part 11 or the part 4 where the electrode part 5 is difficult to appear in the external shape, as shown in FIG. 6(b),
As shown in FIG. 8(b), those electrode images E,
F can be clearly recognized.

Next, the component transfer mounting unit 9 moves the component 1 and the like onto the electronic circuit board 7 on which it is to be mounted. At the same time, the board positioning section 8 moves the electronic circuit board 7 to the component mounting position indicated by the above data. Then, the control unit 12 issues a command to the component transfer and mounting unit 9 and the board positioning unit 8 to correct the rotational shift and positional shift of the component, according to the attitude and positional shift amount of the component holding unit 11 and the component recognized by the image recognition unit 10. send. As a result, the component holding section 11 and the board positioning section 8 perform operations to rotate the component and correct the position of the electronic circuit board 7 in accordance with the command, and the component 1 etc. held by the component holding section 11 are positioned. The electronic circuit board 7 is placed in a state where it faces properly. After this, the component transfer mounting section 9 holds the component 1
etc. are mounted on the electronic circuit board 7. All of these operations are performed under the control of the control section 12.

Next, the procedure for creating selection data for selecting the transmitted illumination recognition means A and the reflected illumination recognition means B according to the type of component will be explained using the flowchart shown in FIG. The dimensions of the component to be mounted, the number of electrodes (number of leads), and the type of component (e.g. square chip, QFP, PL
Component data indicating classification according to the characteristics of component packages such as CC, etc. is input into the control unit 12 in advance. Therefore, first, this part data is called (step #1). Then, evaluate the component data using a predetermined function (Step #2)
, it is determined whether transmitted illumination recognition means A or reflected illumination recognition means B is used (step #3). In this embodiment, the evaluation function for component data is as follows.

For each chip, if the size of the component is smaller than the component holding part 11, the reflected illumination recognition means B is selected;
If the dimensions are larger than the component holding section 11, the transmitted illumination recognition means A is selected. Also PLCC, SOJ, QFP, S
In the case of each package such as OP, reflected illumination recognition means B is selected for all. Furthermore, for a component with a simple shape and color variation, if the component size is smaller than the component holding section 11, the reflected illumination recognition means B is selected, and if the component size is larger than the component holding section 11, the transmitted illumination recognition means A is selected. Select (Step #3).

After selecting the recognition means to be used in the image recognition unit 10 in this way, the parts are recognized by the selected recognition means (step #4 or #5), and then it is determined whether this recognition has been performed properly. If it is not appropriate, change the selection of the recognition means to be used and perform recognition again.

This procedure is then repeated for all the parts to be mounted (step #8) to create recognition means selection data.

The created recognition means selection data is registered for each part. In the component mounting machine of this embodiment, the recognition means selection data as described above is created during the first similar component mounting operation according to the mounting data. It is also possible for the operator of the component mounting machine to confirm the determinations in steps #6 and #7 and switch the selection of the recognition means.

According to the above-described component mounting machine of the present invention, the reflected illumination recognition means B is used for components whose dimensions are smaller than the component holding section 11 of the component transfer and mounting section 9, and for components whose component electrodes are difficult to appear on the outside. In addition, since the transmitted illumination recognition means A is used for parts that are larger than the part holding part 11, have a simple part shape, and have many variations in color, various parts can be recognized with high precision and high reliability. Can be implemented.

[0021]

Effects of the Invention According to the present invention, the control section can switch between the transmitted illumination means and the reflected illumination means depending on the type of parts to be mounted, and can be used for parts with simple shapes and variations in color. By capturing an external image of the component using transmitted illumination recognition means, it is possible to properly recognize the posture and positional deviation of this component, and it is also possible to recognize parts that are smaller than the component holding section of the component transfer and mounting section, For parts where the electrode part is difficult to appear on the outside of the part, the posture and positional deviation of the part can be properly recognized by capturing an image of the bottom surface of the part by using reflected illumination recognition means. It is possible to reliably and appropriately correct the posture and positional deviation of various types of components, and to mount components with high precision and reliability.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a component mounting machine as an embodiment of the present invention.

FIG. 2 is a block diagram of the component mounting machine shown in FIG. 1;

FIG. 3 is an enlarged schematic configuration diagram of an image recognition section.

FIG. 4 is a flowchart showing a procedure for creating image recognition means selection data.

FIG. 5 is a plan view and a front view showing a microelectronic component.

FIG. 6 is an explanatory diagram showing an example of an image captured by a transmitted illumination recognition means and a reflected illumination recognition means of a microcomponent.

FIG. 7 is a plan view, a bottom view, and a side view showing a PLCC package.

FIG. 8 is an explanatory diagram showing an example of an image captured by a transmitted illumination recognition means and a reflected illumination recognition means of a PLCC package.

[Explanation of symbols]

1, 4 Parts 2, 3 Illumination light 6 Parts supply department 7 Electronic circuit board 8 Board positioning part 9 Parts transfer and mounting department 10 Image recognition section 11 Parts holding part 12 Control section A Transmitted illumination recognition means B Reflected illumination recognition means

Claims (1)

[Claims] Claim 1: A component supply section that supplies components to be mounted, a mounting object positioning section that positions and holds an object to be mounted, and a mounting object positioning section that moves the components to be mounted from the component supply section onto the mounting object. A component transfer and mounting section that transfers the components to a predetermined position on the object to be mounted, and a component holding section of the component transfer and mounting section that images the components being transferred at a predetermined position in the component transfer and mounting section. an image recognition unit that recognizes the orientation and positional deviation of the component and instructs the required unit to correct the mounting orientation and position so that the component is mounted at a predetermined position on the object to be mounted; and the component supply unit; In a component mounting machine equipped with a control section that controls the operations of an object positioning section, a component transfer mounting section, and an image recognition section,
Transmitted illumination recognition means in the image recognition section that illuminates the component held in the component holding section of the component transfer and mounting section from the component holding section side and captures and recognizes an image of the component using transmitted light;
reflected illumination recognition means for illuminating the component from the side opposite to the component holding section and capturing and recognizing an image of the component using reflected light; A component mounting machine characterized in that it can be used in a switching manner.