JPH04364404A - Electronic parts lighting method - Google Patents

Abstract

PURPOSE:To enable generation of noise image to be minimized for reducing recognition error and achieve a more reliable position/attitude recognition by lighting a light-emitting body at a position which is determined by a function and then illuminating a needed portion by controlling an illumination angle, an illumination position. and a light-emitting intensity of an illumination light. CONSTITUTION:An illumination light-emitting control portion 2 receives shape characteristic data such as a type, a dimension, the number of electrodes, and a direction of electrode of electronic parts 10 to be illuminated, and then performs processing with a previously set function. An LED is turned on or off and a light-emitting intensity of the entire LED to be lit is determined by a function of the control portion 2. The illumination position control portion 4 receives a shape characteristic data of parts from the control portion 3, a distance between the LED and electronic parts and a lighting irradiation angle are determined for each side of four sides by a preset function, and then only a needed portion of the parts 10 is lit. A recognition error is reduced without achieving lighting with a brightness exceeding a required level and by minimizing generation of an unneeded noise image.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention has a function of recognizing the position and orientation of an electronic component using a visual recognition device, correcting deviations in position and orientation, and mounting the electronic component at a predetermined position on an electronic circuit board. The present invention relates to an electronic component lighting method for an electronic component mounting apparatus.

0002

[Background Art] In electronic component mounting equipment that mounts predetermined electronic components on electronic circuit boards, when transferring electronic components from a component supply section onto the electronic circuit board, a visual recognition device is used to detect the electronic components being transferred. A commonly used method is to recognize the position and orientation of components, correct position and orientation deviations, and mount electronic components on electronic circuit boards with high precision. There are two types of visual recognition methods used in electronic component mounting apparatuses in terms of lighting methods: The first method is a transmitted illumination recognition method in which illumination light is applied from the background side of an electronic component as a target object to obtain a contour image of the electronic component and process it. The second method is a reflected illumination recognition method in which illumination light is applied from the surface side of an electronic component as a target object to obtain and process images of the body of the electronic component and the electrode section of the electronic component. The transmitted illumination recognition method has been commonly used in electronic component mounting equipment, and the reflected illumination recognition method has been used in recent years. Examples of each are shown in FIGS. 7 and 8.

FIG. 7 shows an example of an illumination method of the transmitted illumination recognition method (hereinafter referred to as the transmitted illumination method), in which the electronic components held by the transfer section of the electronic component mounting equipment are arranged on a flat surface. A plurality of LEDs are used to illuminate the electronic component from the component holder side (that is, the background side of the electronic component) to obtain an outline image of the electronic component. The transmitted illumination method is often used when the size of the electronic component to be mounted is sufficiently large compared to the electronic component holding section of the transfer section.

FIG. 8 shows an example of an illumination method (hereinafter referred to as reflected illumination method) of the reflected illumination recognition method, in which the surface of the electronic component is illuminated from the TV camera side, and the body of the electronic component,
and an image of the electrode part was obtained. The reflected illumination method is used when the dimensions of the electronic component to be mounted are smaller than the electronic component holding section of the transfer section, and when the electrode part of the electronic component is difficult to appear on the outline of PLC.
It is used to recognize the electrode parts of C, SOJ package parts, and it is used to identify the position and position of electronic parts with higher accuracy than the transmitted illumination method.
Can recognize posture.

[0005]

[Problems to be Solved by the Invention] However, images of electronic components obtained by the above-mentioned reflected illumination method include images of electronic component holding parts in the transfer section of electronic component mounting equipment, in addition to images of the body and electrode parts of electronic components. Images and images of chips from the electronic component supply body are often mixed together (see FIG. 6). For this reason, there are many cases where images of the electronic component holding part or noise images caused by chips from the electronic component supply body are mistakenly recognized as images of the electrodes of the electronic components, making it impossible to obtain accurate positions and orientations of the electronic components. ing.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an electronic component illumination method that reduces the generation of noise images unnecessary for recognizing the position and orientation of electronic components.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a plurality of light emitters that emit illumination light in the direction of an object in a circular or polygonal shape centered around an electronic component that is an object. , process shape characteristic data such as the type, dimensions, number of electrodes, electrode direction, etc. of the electronic component using a predetermined function, and light up the light emitter at the position determined by the function among the multiple light emitters to display the electronic component. to illuminate. Furthermore, the plurality of light emitters are moved within a predetermined range to change the irradiation angle and irradiation position of the illumination light according to a predetermined function. Moreover, it has a configuration in which the light emission intensity of the light emitting body to be lit is determined according to a predetermined function, and the electronic component that is the object is illuminated.

[0008]

[Operation] Since the present invention controls the light emitting body that illuminates the electronic component with the above-described configuration, when the size of the electronic component is smaller than the electronic component holding part, the electrode part that represents the position and orientation of the electronic component Since it is possible to illuminate only the area that is not needed for position/orientation recognition, it is possible to minimize the generation of noise images that cause recognition errors. It is possible to provide lighting that is suitable for recognizing the position and orientation of electronic components ranging from parts to large components of 40 mm x 40 mm, and also minimizes the generation of unnecessary noise images by not illuminating electronic components with more brightness than necessary. This reduces recognition errors and enables more reliable position and orientation recognition.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 4(a) is an external perspective view of a component lighting section of an electronic component mounting facility using the electronic component lighting method of the present invention, and FIG. 4(b) is a block diagram showing control of the component lighting section in the electronic component mounting facility. It is a diagram. In this embodiment, the light emitter 1
LEDs are used for each side, and 8 LEDs are arranged on each side in a square shape, for a total of 32 LEDs. Depending on the individual luminance of the LED used, multiple LEDs may be arranged on one side (
(See arrangement in Figure 8). In FIG. 4(b), the illumination light emission control unit 2 receives shape characteristic data such as the type, dimensions, number of electrodes, electrode direction, etc. of the electronic component 10 to be illuminated from the main control unit 3 of the electronic component mounting equipment, and sets the data in advance. Processing is performed using a certain function. The LED1 is controlled by the function of the illumination light emission control unit 2.
The LEDs are turned on and off one by one, and the light emission intensity of the entire LED to be lit (the lighting voltage and current since it is an LED) is determined. In this embodiment, the LED to be lit is determined based on the type, size, electrode direction, number of electrodes, and electrode pitch of the electronic component 10. Then, the light emission intensity of the LED is determined based on the type of electronic component 10, and the electronic component 10 is illuminated. Let n be the number of the LED,
The function set in the illumination light emission control unit 2 is the lighting function LED (
n)=f1 (type, size, electrode direction, number of electrodes, electrode pitch, n), and emission intensity function I(n)=f2 (type, n).

In FIG. 4(b), the illumination position control section 4 receives the shape characteristic data of the component from the electronic component mounting equipment main control section 3, and adjusts the LED and electronic component for each of the four sides using a preset function. Determine the distance to and the illumination angle. The function set in the illumination position control unit 4 is the distance function L(d)=f3, where d is the side number (1 to 4).
(type, dimensions, electrode direction, d), irradiation angle function θ(d)
= f4 (type, size, electrode direction, d).

Examples of illumination are shown in FIGS. 1, 2, and 3. Figure 1 (
A) is an example of a small rectangular chip component with electrodes in two directions, and only the LEDs in the shaded areas are lit according to the electrode direction and size. FIG. 1(b) is an example of a QFP package component with four-way electrodes, and all LEDs are lit according to the component. FIG. 2(a) shows an example of illumination of a small electronic component, in which the distance between the electronic component and the LED is shortened according to the dimensions, and the irradiation angle is set to θa so that the illumination light is irradiated onto the electrode portion. FIG. 2(b) is an example of illuminating a large electronic component, in which the LED is moved in accordance with the electrode portion (located at the end) of the large electronic component, and the irradiation angle of the illumination light is θb. FIG. 3(a) is an example of illumination of an electronic component whose electrode portion is difficult to reflect, and the light emission intensity of the LED is increased depending on the type. Figure 3(b) is an example of lighting for electronic components whose electrode parts tend to reflect.
Illumination is done by reducing the intensity of the light emitted from the light.

FIG. 5 shows an example of an image resulting from illumination of the electronic component mounting equipment of this embodiment. FIG. 6 is an example of an image when the same electronic component is illuminated using a conventional illumination method. When illuminating an electronic component smaller than the component holding part, the conventional illumination method (Fig. 6 (a)
)), the component holder image is reflected in the background of the electronic component image, whereas in the lighting method of this embodiment (FIG. 5(a)), the component holder image is at the same level as the background image,
Moreover, the image of the electronic component itself shows only the electrode part image. Similarly, when a large electronic component is illuminated, the conventional illumination method (Fig. 6(b)) shows the chip image of the component supply body and the body image of the electronic component together with the electrode part image. Example lighting method (Figure 5 (
In b)), only the electrode part image is obtained. In the image shown in FIG. 5, the electrode portion of the electronic component can be correctly recognized, and the position and orientation of the electronic component can be determined with high accuracy.

As described above, according to the electronic component illumination method of the embodiment of the present invention, the illumination conditions by the light emitter are set according to the component, so that noise images unnecessary for recognizing the position and orientation of the electronic component are eliminated. occurrence can be reduced.

[0014]

Effects of the Invention As is clear from the above embodiments, according to the present invention, in order to recognize the position and orientation of an electronic component as an object, only the necessary portions are illuminated according to the electronic component. The generation of noise images, which is a problem with conventional reflected lighting methods, can be reduced, and recognition errors in various electronic components are reduced, making it possible to recognize the position and orientation of high-quality electronic components with higher reliability. We can provide a lighting method for electronic components that realizes mounting.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a method for illuminating electronic components according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a method for illuminating electronic components according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a method for illuminating electronic components according to a third embodiment of the present invention.

FIG. 4 is a perspective view and a block diagram of an apparatus in an electronic component illumination method according to an embodiment of the present invention.

[Figure 5] Schematic diagram showing an example of an image obtained by the same method

[Fig. 6] A schematic diagram showing an example of an image obtained by a conventional electronic component illumination method.

[Figure 7] Schematic diagram of a conventional electronic component illumination method (transmission illumination method)

[Figure 8] Schematic diagram of conventional electronic component illumination method (reflection illumination method)

[Explanation of symbols]

1a, 1b, 1c, 1d light emitter 2
Illumination light emission control section 3 Main control section 4 Illumination position control section 10 Electronic components

Claims (3)

[Claims] [Claim 1] A plurality of light emitters that emit illumination light in the direction of the object are arranged in a circular or polygonal shape centered around an electronic component as the object, and shape characteristic data of the electronic component is predetermined. processing according to a function, and lighting a light emitting body at a position determined by the function among the plurality of light emitting bodies,
An electronic component lighting method for illuminating the electronic component. 2. The electronic component illumination method according to claim 1, wherein the plurality of light emitters are moved within a predetermined range to change the irradiation angle and irradiation position of the illumination light onto the electronic component in accordance with a predetermined function. 3. The electronic component lighting method according to claim 1, wherein the electronic component is illuminated by determining the luminous intensity of the light emitting body to be lit according to a predetermined function.