JPS6257281A - Part position recognition equipment for part 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 Field of Industrial Application The present invention is a component mounting machine that automatically mounts electronic components such as chip resistors and chip multilayer capacitors onto a substrate constituting an electronic circuit. The present invention relates to a component position recognition device that recognizes the position of a picked-up electronic component using an image input device.

There is a device shown in FIG. 7 as a component position recognition device conventionally used in a conventional component placement machine. In this conventional example, a ring-shaped lighting fixture equipped with an optical fiber is attached to the suction 7z (a) of the mounting head, and the image of the component C obtained by the light rays emitted from this ring-shaped lighting fixture is used as an image on a television camera, etc. The information is input to input device d.

In addition, the present applicant has proposed a device in which a reflecting mirror is first attached to the suction nozzle, a light beam is irradiated from a lighting device to this mirror, and an image of the part obtained by the reflected light is inputted to an image input device. It has also been proposed that a diffused reflection illumination body is attached to the nozzle, a light beam is irradiated from both the illumination source to the nozzle, and an image of the component obtained by the scattered light is inputted to an image input device.

811゜However, when the ring-shaped lighting fixture l] was attached to the suction nozzle a, the suction nozzle a became heavier by its weight, making it difficult to increase the speed of the mounting head. .

In addition, products with a reflector attached are relatively lightweight, which alleviates the weight problem, but since they use total internal reflection from the lighting equipment, the light irradiated onto the parts may have uneven brightness and darkness depending on the location, resulting in poor images. There is a problem that it is not possible to obtain
For example, if the method is to be applied to a large component with a negative side of about 40 +n+++, the weight of the reflecting mirror becomes a problem, and the unevenness in brightness becomes even larger, resulting in a poor recognition rate.

Furthermore, when a diffused reflection illuminator is attached, parts are illuminated with scattered light, which eliminates uneven brightness, but if a large diffused reflection illuminator that can be applied to large parts is installed, the weight increases, making it difficult to increase speed. There is a problem with becoming. In addition, in a component placement machine where the placement head is equipped with multiple suction nozzles, if the diffused reflection illumination body is made larger, the pitch between the suction nozzles must be increased, which causes the problem that the placement head becomes larger accordingly. It turns out.

The present invention aims to solve the above problems.

Means for Solving the Problems In order to achieve the above object, the present invention provides a component position recognition device in a component placement machine that uses an image input device to recognize the position of a component picked up by a suction nozzle of a placement head. The diffused reflection illumination body that irradiates scattered light onto the component being picked up by the nozzle and projects an image of the component onto the image input device is constructed separately from the suction nozzle and is divided into multiple pieces to illuminate the area around the suction nozzle. It is characterized by being movable between a position suitable for projecting an image and a retracted position away from the suction nozzle.

Function Since the present invention has the above-described configuration, the suction nozzle can be made lighter because the diffused reflection illumination body is a separate body, and when recognizing the position of a component, the diffused reflection illumination body can be used to project an image around the suction nozzle. By positioning it at an appropriate position, an image of the component created by even scattered light can be input to the image input device, and once position recognition is completed, the diffused reflection illuminator is moved to a position away from the suction nozzle, and the mounting head is can be moved at high speed and parts can be mounted efficiently.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to FIGS. 1 to 6.

3 and 4 show the overall configuration of the electronic component mounting machine. Reference numeral 1 denotes a component supply section, in which a large number of component supply cassettes 2 are arranged in parallel, and the whole is configured to be movable in the direction of the parallel arrangement. Each component supply cassette 2 holds a tape-shaped electronic component assembly containing a large number of electronic components in a row, and the electronic components at the component extraction position are sucked by the suction nozzle 4 of the mounting head 3. It is configured to intermittently send out electronic components each time they are taken out.

A plurality of suction nozzles 4 are installed in the mounting head 3 so as to be movable up and down in order to accommodate the size and shape of electronic components, and by rotating the mounting head 3, the desired suction nozzles 4 can be moved to the operating position. It is configured so that it can be located at

A plurality of mounting heads 3 having such a configuration are arranged on the outer periphery of the rotary table 5 at equal intervals in the circumferential direction, and the rotary table is configured to rotate intermittently at each arrangement interval. As the rotary table 5 rotates intermittently, it circulates through various positions such as a component extraction position A, a component regulation position NB, a component recognition position C1, a component attitude adjustment position D, a component mounting position E, and a suction nozzle selection position F. ing. In this way, the suction nozzle 4 is lowered at the component extraction position A to take out the component from the component supply cassette 2, the position of the suctioned component is regulated at the component regulation position B, and the component position recognition device 6 is operated by the component recognition device 1c. The position of the component is detected, the rotation device 7 rotates the suction nozzle 4 at the component orientation adjustment position to adjust the orientation of the component, and the component mounting position E is configured to be movable in two horizontal directions. The suction nozzle 4 is lowered onto the board 9 placed on the table 8 to mount the component.
The mounting head 3 is moved by the drive device 10 at the suction nozzle selection position F.
The suction nozzles are switched by rotating the suction nozzle 4 so that the desired suction nozzle 4 is in the operating position.

Next, the component position recognition device 6 at the component recognition position C
The configuration will be explained with reference to FIGS. 1 and 2. Around the lower end of the suction nozzle 4, there is a conical plate-shaped diffused reflection illumination body whose inner and outer circumferential surfaces are conical surfaces and is made of a material such as polyacecool resin (Duracon, a trademark of DuPont), which diffusely reflects internally to produce scattered light. 11 are arranged. This diffusely reflecting illumination body 11 is divided into two by a plane passing through its axis, and a first
As shown by the arrows in the figure, each is configured to be retractable diagonally upward, and has outer thorns around the suction nozzle 4 to a position suitable for projecting an image and a position 16 that is retracted away from the suction nozzle 4. It is possible to move between. Further, the outer circumferential surface of the diffusely reflecting illumination body 11 is made rough and formed into a diffusely reflecting surface. A plurality of illumination devices 12 using optical fibers or the like are arranged around the diffused reflection illumination object 11 and are spaced at appropriate intervals to emit light rays toward the diffused reflection illumination object. Diffuse reflection illumination body 11
Scattered light generated by diffuse reflection on the outer peripheral surface and inside of the suction device 7 is irradiated onto the component 13 adsorbed by the suction nozzle 4, and the image is inputted to the image input device 14. Also,
The lighting device 12 is arranged so that its direct light and the light reflected by the component 13 are not input to the image input device 14. The image input device 14 is configured to use a television camera to accurately recognize the position of the inputted image of the component 13 on a horizontal plane.

Furthermore, this image input device 14 is movable in two horizontal directions (X direction and Y direction) that are orthogonal to each other, as shown by arrows in FIG. It is configured.

According to the above configuration, the light rays emitted from the lighting fixture 12 enter the diffusely reflecting illuminating body 11 and are diffusely reflected, and some of the light rays are diffusely reflected on the surface of the diffusely reflecting illuminating body 11, and the light generated by these scattered lights. The image of the part 13 is input to the image input device 14, and the image with good contrast allows the part 1 to be
3 position is reliably recognized. When the recognition of the position of the component 13 is completed, the diffused reflection illumination body 11 moves to its retracted position, and the rotary table 5 rotates intermittently. When the next component 13 is suctioned by the suction nozzle 4 and placed at the component recognition position, the diffuse reflection illumination body 11 returns to a position suitable for irradiation, and the above operation is repeated thereafter. In this way, by providing the diffused reflection illumination body 11 that can be divided and moved away separately from the suction nozzle 4, the suction can be performed even when a large diffused reflection illumination body 11 is used so that it can handle large parts 13. The weight of the nozzle 4 does not increase, and parts can be mounted at high speed.

Furthermore, by making the image input device 14 movable, it is possible to recognize the position of a large component with an inexpensive device having a small recognition area.

The diffused reflection illumination body 11 may be made of a resin that generates scattered light such as the polyacetal resin, polyamide resin ("nylon"), or polypropylene resin, or a transparent material such as transparent resin or glass mixed with a filler to produce scattered light. In addition to using a reflector that produces a diffused reflection surface, it is also possible to use a reflector whose reflective surface is subjected to a satin finish to form a diffused reflection surface.

Further, in the above embodiment, only the diffuse reflection illumination body 11, which is divided and movable, is provided separately from the suction nozzle 4, but as shown in FIGS. 5 and 6, A small diffused reflection illuminator 15 may be attached to the lower end of the suction nozzle 4. With this configuration, when recognizing the position of a large component 13 as shown in FIG.
On the other hand, if the component is small as shown in FIG. 6, there is a risk that the light rays from the inner circumference of the diffused reflection illuminator 11 may not be accurately irradiated onto the component 13, so the diffused reflection illuminator 11 should be moved away. Then, by emitting scattered light from a small diffused reflection illumination body 15 attached to the suction nozzle 4, it becomes possible to form an appropriate image.

Furthermore, in the above embodiment, a component mounting machine in which a plurality of mounting heads are provided on a rotary table that rotates intermittently is exemplified. It is also applicable to a configuration in which the mounting head moves back and forth. Further, in the above embodiment, the mounting rod 3 is provided with a plurality of suction nozzles 4, but it is naturally applicable to a case in which a single suction nozzle is provided.

Effects of the Invention According to the component position recognition device in the component mounting machine of the present invention, as described above, the diffused reflection illumination body irradiates the component picked up by the suction nozzle with scattered light and projects an image of the component onto the image input device. is constructed separately from the suction nozzle and can be divided into multiple parts so that it can be moved between a position suitable for projecting an image around the suction nozzle and a retracted position away from the suction nozzle. Even when using a large diffused reflection illumination object that can irradiate light, the weight of the suction nozzle can be reduced by separating it from the suction nozzle.
In addition, when recognizing the position of a component, it is possible to position the diffused reflection illumination body at a position suitable for projecting an image around the suction nozzle, and to input the image of the component using even scattered light into the image input device. , it is possible to properly recognize the position of large parts and move the placement head at high speed.
parts can be mounted efficiently.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a main part of an embodiment of the present invention, FIG. 2 is a perspective view of the main part, FIG. 3 is a perspective view showing the overall schematic configuration of a component mounting machine, and FIG. 5 is a partial sectional front view of the main part of another embodiment, FIG. 6 is a sectional front view of the main part in the same operating state, and FIG. 7 is a front view of the main part of the conventional example. FIG. 3 is a partially sectional front view. 3...Mounting head 4...Suction nozzle 6...Component position recognition device 11...Diffuse reflection illumination body 12...Lighting 13. . . . Part 14 . . . Image input device 15 . . . Diffuse reflection illumination body. Agent: Patent Attorney Toshio Nakao (1 person) Figure 1 Figure 5 Figure 6 Figure 4 Group 2] Figure 7

Claims (1)

[Claims] In a component position recognition device in a component placement machine that uses an image input device to recognize the position of a component being picked up by a suction nozzle of a placement head, scattered light is irradiated onto the component being picked up by a suction nozzle to create an image of the component. The diffused reflection illumination body projected onto the input device is constructed separately from the suction nozzle and divided into a plurality of parts, and between a position suitable for projecting an image around the suction nozzle and a position separated from the suction nozzle and evacuated. A component position recognition device for a component placement machine, characterized in that the component position recognition device is movable in a component placement machine.