JPH09252198A - Apparatus for reading electronic component and apparatus for mounting electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to obtain a clear image even without increasing the quantity of light, by making it possible to efficiently illuminate and to deal with the direct illumination and transmission illumination in response to the kind of an electronic component. SOLUTION: The apparatus for mounting an electronic component comprises a reflecting plate R1 disposed behind the component P1, a transmission illuminating light source for illuminating a light toward the plate to brighten the background of the component, a direct illuminating light source for illuminating a light to the component itself, and a line sensor 9 for introducing the reflected light from the plate or the component to itself and outputting image information. The transmission source has a first light source unit 13 and a second light source unit 14 disposed at both sides of the sensor 9 so that a first band light L1 illuminated from the unit 13 to the plate R1 and a second band light L2 illuminated from the unit 14 to the plate R1 are disposed in such a manner that the sensor 9 receives the reflected light on the plate R1. Further, the direct source has a third light source unit 20 for illuminating a third band light L3 to the area where the sensor 9 receives the reflected light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component reading device and an electronic component mounting device which improve an image reading process of electronic components.

[0002]

2. Description of the Related Art In most conventional electronic component mounting apparatuses, electronic components picked up from a parts feeder are
Observe using an image reading device before mounting on the board,
The image processing unit obtains the positional deviation with respect to the ideal position, corrects the positional deviation, and mounts it on the substrate. Here, as the image reading device, one that reads an image two-dimensionally (the former) and one that reads the image one-dimensionally in the main scanning direction orthogonal to the moving direction of the electronic component and reads the one-dimensional image 2 of the one that accumulates in the sub-scanning direction and becomes two-dimensional (the latter)
There is one.

Here, in recent years, there have been various electronic parts from very small ones to large ones having a large number of leads, and the latter is advantageous because it is easy to obtain a higher resolution image.

Therefore, according to the latter idea, a one-dimensional line sensor is used and an electronic component is read by moving the electronic component in a direction orthogonal to the main scanning direction of the line sensor (arrangement direction of light receiving portions) to acquire an image. There is an electronic component mounting apparatus in which the apparatus is incorporated.

[0005]

In this device, a reflector is positioned behind a nozzle for adsorbing an electronic component (that is, behind the electronic component), and a ring-shaped light source is used to brighten the entire reflector. The entire reflector is illuminated with uniform light to brighten the background of the electronic component (transmissive illumination).

However, in recent years, in order to shorten the tact time of the transfer operation of the electronic component mounting apparatus, the transfer speed of the electronic component is increased, and as a result, the time for the electronic component to traverse the line sensor becomes very short. There is. Therefore, according to the conventional electronic component mounting apparatus, the amount of light incident on the line sensor tends to be insufficient, which makes it difficult to perform accurate recognition. Here, simply increasing the amount of light of the light source that irradiates the light diffuser plate can be considered as one of the countermeasures, but if this is done, the life of the light source may be shortened or the power consumption may increase. Such side effects are unavoidable.

Further, depending on the type of electronic component, such as BGA, the electronic component itself may be irradiated with light (direct irradiation). In the conventional electronic component reading device, direct illumination is also performed as described above. Since the configuration is such that a ring-shaped light source is added, the above-mentioned problems become more serious.

[0008] Therefore, an object of the present invention is to provide an electronic component reading apparatus which can obtain a clear image without increasing the light quantity.

[0009]

An electronic component reading apparatus of the present invention includes a reflector located behind the electronic component, and a transillumination light source section for illuminating the reflector with light to brighten the background of the electronic component. , A direct illumination light source unit that irradiates the electronic component itself with light, and a line sensor that outputs image information by receiving reflected light from a reflector or reflected light from the electronic component, and the transmissive light source unit includes a line sensor. Located on both sides of
A second light source unit including a light source unit and a second light source unit, wherein the first light source unit irradiates the reflection plate with the first strip-shaped light and the second light source unit irradiates the reflection plate
The band-shaped light is arranged on the reflection plate so as to hit the area where the line sensor enters the reflected light, and the direct illumination light source unit irradiates the area where the line sensor enters the reflected light of the electronic component with the third band-shaped light. The third light source unit is included.

[0010]

According to a first aspect of the present invention, a reflector located behind an electronic component, a transillumination light source unit that illuminates the reflector to illuminate the background of the electronic component, and the electronic component itself is illuminated with light. And a line sensor that outputs image information by receiving reflected light from a reflector or reflected light from an electronic component, and the transmissive light source units are located on both sides of the line sensor. Including a first light source unit and a second light source unit,
The first band-shaped light that the first light source section irradiates the reflector and the second band-shaped light that the second light source section irradiates the reflector are arranged on the reflector so that the line sensor impinges on the area where the reflected light enters. The direct illumination light source unit includes a third light source unit that irradiates the area where the line sensor enters the reflected light of the electronic component with the third band-shaped light. By the way, since the image is acquired by the line sensor, even if the entire reflector is brightened as in the conventional electronic component reading apparatus, the area effective for image reading in the reflector is the area of the line sensor. Since it is limited to a very limited area directly above it, the lights that are applied to areas other than this very limited area are completely wasted. Therefore, in the present invention, with the above-described configuration, the band-shaped light of each of the first light source unit and the second light source unit can be concentrated on the limited area described above, and the light can be used without waste. Further, even when direct illumination is performed, light can be concentrated on a limited area of the electronic component that is incident on the line sensor, and efficient illumination can be performed without waste.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of an electronic component mounting apparatus according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 is a base, and 2 is a conveyor which is provided in the central portion of the base 1 in parallel with the X direction and which conveys and positions the substrate 3.
Reference numeral 4 denotes a part feeder that is provided in front and rear of the base 1 so as to face each other with the conveyor 2 interposed therebetween and supplies the electronic parts P. 5 is a Y-axis provided on both sides of the base 1, 6 is an X-axis provided on the Y-axis 5, 7 is an X-axis,
It is a transfer head that moves in the XY directions by the shaft 6 and the Y-axis 5.

A typical moving path of the transfer head 7 is as shown by an arrow in FIG. 1, and an image reading device 8 is provided in the recognition path M1 among them.

Next, referring to FIG. 2, the transfer head 7
The configuration of the image reading device 8 will be described. As shown in FIG. 2, the transfer head 7 has three units U1 to U3 in this embodiment. Each unit U1-U3
Are nozzles N1 to N3 for adsorbing the electronic components P1 to P3 on the lower end, lift motors Z1 to Z3 for moving the nozzles N1 to N3 up and down, and rotary motors θ1 to rotate the nozzles N1 to N3 in a horizontal plane by θ. θ3 and nozzles N1 to N
3 and has reflectors R1 to R3 that are coaxially mounted and that are located behind the electronic components P1 to P3.

The image reading device 8 has the following elements. That is, 10 is a telecentric lens 1 at the center.
2 is a light source unit that includes a first light source unit 13 and a second light source unit 14 that are provided on both sides of the telecentric lens 12 and that irradiate band-shaped light above the axis of the telecentric lens 12. The first light source unit 13 and the second light source unit 14 include line-shaped light sources, and the light source units 13 and 14 constitute a transillumination light source unit.

Further, 11 is a telecentric lens 12
Half mirror that splits the light transmitted through
Is a line sensor which is arranged directly below the telecentric lens 12 and is composed of a one-dimensional CCD in which the main scanning direction S is oriented in a direction orthogonal to the recognition path M1. The light laterally branched by the half mirror 11 is made incident on the two-dimensional CCD 15 for monitoring the observation situation by the operator. The image read by the line sensor 9 is output to an image recognition unit (not shown), and the position of the electronic component is recognized.

In addition, before and after the recognition path M1 of the light source unit 10, a third light source section 20 and a fourth light source section 21 including a linear light source are arranged similarly to the first light source section 13 and the second light source section 14. Has been done. The third light source section 20 and the fourth light source section 21 are elements that directly constitute the illumination light source section, and are configured to directly irradiate the electronic component with the band-shaped light.

Next, the irradiation positions of the band-shaped light by the transmissive illumination light source unit and the direct illumination light source unit will be described with reference to FIG. Note that FIG. 3 shows a state in which both the transmissive illumination light source unit and the direct illumination light source unit are operating for the sake of description, but these light source units are selectively operated depending on the type of electronic component. Therefore, both light source units are not normally operated at the same time.

As shown in FIG. 3, in the transmitted illumination light source section, the first light source section 13 directs the first band-shaped light L1 and the second light source section 14 directs the second band-shaped light L2 to the reflector R1. And irradiate. Here, the area where the line sensor 9 enters the reflected light is limited to a fixed narrow rectangular area. Therefore, the first band-shaped light L1 and the second band-shaped light L2 are focused only on this area, and moreover, the first band-shaped light L1 and the second band-shaped light L2 are on the recognition path M1 (in FIG. On the center locus). This meaning will be described later with reference to FIG.

Of the direct irradiation light source section, the third light source section 20 has the third band-shaped light L3, the fourth light source section L4, and the surface of the lower surface of the electronic component P which passes through the line sensor 9 respectively.
Irradiate only the rectangular area to be incident on.

By the way, the height (thickness) of an electronic component differs depending on its type. However, since the depth of focus of the line sensor 9 is constant, the lower surface of the electronic component observed by the line sensor 9 must pass through the line sensor 9 at a constant height.

By the way, when the height T1 of the electronic component P1 is large, as shown in FIG. 4A, when the lower surface of the electronic component P1 is positioned at a constant height H from the line sensor 9, the reflector plate is formed. The height of R1 is (E + T1, where E is the height of the nozzle N1) from the lower surface of the electronic component P1. At this time, the first band-shaped light L1 and the second band-shaped light L2 that strike the reflector R1 overlap each other in the recognition path M1. Therefore, as shown in FIG. 4C, the line sensor 9 is incident on the reflector R1. The entire area (field of view) to be illuminated is illuminated brightly. On the other hand, as shown in FIG. 4B, when the height T2 of the electronic component P2 is small, the reflector R1 positions the lower surface of the electronic component P2 at a certain height H from the line sensor 9,
The reflector R1 is at a height (E + T2) from the lower surface of the electronic component P2.
In the position. At this time, as shown in FIG.
As shown in (d), the first band-shaped light L1 and the second band-shaped light L2
Are overlapping.

As is apparent from a comparison between FIG. 4C and FIG. 4D, the height of the electronic component is small and the reflector R1
When the height of the electronic component is large and the reflector R1 is at a relatively high position (FIG. 4 (c)), the first band shape is higher than that at a relatively low position (FIG. 4 (d)). The portion where the light L1 and the second band-shaped light L2 overlap (hatched portion) becomes narrow. However, even if the electronic component to be mounted has the highest height, it is possible to perform transmitted illumination without trouble regardless of the type of electronic component if the overlapping portion is sufficiently secured. .

[0024]

According to the electronic component reading apparatus of the present invention, a reflector located behind the electronic component, a transillumination light source unit that illuminates the reflector to illuminate the background of the electronic component, and the electronic component itself. A direct illumination light source unit for irradiating light to the light source, and a line sensor for outputting image information by inputting reflected light from a reflection plate or reflected light from an electronic component, and the transmissive light source units are located on both sides of the line sensor. Including a first light source unit and a second light source unit, the first band-shaped light that the first light source unit illuminates the reflector and the second band-shaped light that the second light source unit illuminates the reflector on the reflector plate Since the sensor is arranged so as to hit the area where the reflected light enters, the direct illumination light source section includes the third light source section that irradiates the area where the line sensor enters the reflected light of the electronic component with the third band-shaped light. , With efficient lighting Depending on the type of the electronic component, it is possible to cope with any illumination and transmitted illumination directly.

[Brief description of drawings]

FIG. 1 is a plan view of an electronic component mounting apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of a transfer head and an electronic component reading device according to an embodiment of the present invention.

FIG. 3 is a perspective view of an electronic component reading device according to an embodiment of the present invention.

FIG. 4A is an operation explanatory diagram of the electronic component reading device according to the embodiment of the present invention. FIG. 4B is an operation explanatory diagram of the electronic component reading device according to the embodiment of the present invention. Of operation of the electronic component reading device according to the embodiment of the present invention (d) Operation of the electronic component reading device according to one embodiment of the present invention

[Explanation of symbols]

 9 Line sensor 13 1st light source part 14 2nd light source part 20 3rd light source part P1 Electronic component R1 Reflector L1 1st strip light L2 2nd strip light L3 3rd strip light

Claims (2)

[Claims] 1. A reflector located behind an electronic component, a transmissive illumination light source unit that illuminates the reflector to illuminate the background of the electronic component, and a direct illumination light source that illuminates the electronic component itself. And a line sensor that outputs image information by receiving reflected light from the reflector or reflected light from an electronic component, the transmissive light source unit being a first light source unit located on both sides of the line sensor. And a second light source unit, wherein the first band-shaped light that the first light source unit irradiates the reflector and the second band-shaped light that the second light source unit irradiates the reflector are on the reflector. The line sensor is arranged so as to hit the area where the reflected light is incident, and the direct illumination light source section includes a third light source section that irradiates the area where the line sensor enters the reflected light of the electronic component with the third band-shaped light. Electronic component reading characterized by Apparatus. 2. A positioning unit for positioning a substrate, a parts feeder for supplying electronic components, a transfer head for picking up electronic components from the parts feeder and mounting the electronic components on the substrate, and a transfer head that moves together with the transfer head. An electronic component reading device having a line sensor for observing an electronic component in a moving path of the electronic component is provided, wherein the transfer head is provided with a nozzle for adsorbing the electronic component and behind the electronic component adsorbed by the nozzle. The electronic component reading device has a reflection plate located therein, and the electronic component reading device directs a light source to illuminate the reflection plate with light to illuminate the background of the electronic component and to illuminate the electronic component itself with direct light. The transmission light source unit includes a first light source unit and a second light source located on both sides of the line sensor, and the first light source unit irradiates the reflection plate. The first strip-shaped light and the second strip-shaped light that the second light source section irradiates to the reflector are arranged so as to strike an area on the reflector where the line sensor enters the reflected light, and the direct illumination light source section is provided. Is an electronic component mounting apparatus including a third light source unit that irradiates a third band-shaped light to an area of the electronic component where the line sensor receives reflected light.