JPH01173700A - Posture detection of chuck for electronic component in automatic mounting machine - Google Patents

Abstract

PURPOSE:To accurately insert an electronic component into a printedcircuit board by a method wherein, before the eIectronic component is inserted into the printed-circuit board, the mutual position of an outer shape and a lead of the electronic component is measured, a reference position of a hand is corrected on the basis of this measured result and the component is inserted. CONSTITUTION:A hand 1 which has gripped an electronic component 3 is set in a prescribed position of a plate 5 of a measuring instrument 50; a lead 7 of the electronic component 3 is inserted into a hole 9 in the plate 5. During this operation, a displaced position and a tilt of a target mark 4 on the plate 5 are measured by using a sensor 11; a reference position of the hand is corrected. Accordingly, the position of an outer shape 6 with reference to the lead 7 of the electronic component 3 can be measured easily; it is possible to correct the position of the hand 1. By this setup, it is possible to mount the electronic component 3 on a printed-circuit board accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for detecting the position of an electronic component chuck in an automatic mounting machine that mounts electronic components onto a printed circuit board.

(Prior Art) In an automatic mounting machine for inserting an electronic component a into a printed circuit board 1), there is the following method for accurately inserting the lead C of the electronic component into a prespecified hole d of the printed circuit board.

ΦA device that accurately determines the lead position by grasping the lead of an electronic component.

■A device that grips and inserts the electronic component outline using a component-specific hand that can grasp the electronic component outline with good reproducibility without positional deviation, provided that the dimensional accuracy of the electronic component outline and the position of the leads is guaranteed.

(2) There is a method that moves the hand to a position accurately positioned with respect to the reference line of the TV camera, captures the lead of the electronic component as an image, measures the lead through image processing, and corrects the hand.

(Problems to be Solved by the Invention) In the above-mentioned method of gripping the leads of electronic components, there are many electronic components in which the leads cannot be gripped.

In addition, for those that grasp the external shape of electronic components, screening is required to ensure the external shape of the electronic component and the dimensions of the lead position.
This method has the disadvantage that the number of man-hours required for guaranteeing the guarantee and the defective rate increase. Furthermore, at present, there is no hand that is versatile enough to grip parts of various external shapes with high precision and good reproducibility.

Furthermore, there are the following problems when viewing the leads of electronic components with a TV camera. When inserting the lead of an electronic component into a hole in a printed circuit board, an accuracy of 0.05 mm or less is required; for a TV camera used on a boat, if this resolution is secured, the field of view is limited to a maximum of 25 mm x 25 mm. be.

However, some electronic components have a total length of 60 mm, such as connectors.
It is difficult to accurately measure the position of the lead at once with this field of view. In addition, the positions of electronic component leads change depending on the component, so the image processing software used to find a reference lead and detect the inclination of an electronic component's external shape from multiple leads is also complex. Become. Another disadvantage is that the software is complicated and the measurement time is long.

The present invention has been developed in view of the above-mentioned problems. When mounting electronic components on a printed circuit board, the present invention measures the mutual positional relationship between the hand and the electronic component and corrects the target for moving the hand onto the printed circuit board. The purpose of this is to allow various components to be easily and accurately mounted on a printed circuit board.

(Means and effects for solving the problem) For this purpose, in the present invention, an automatic mounting machine for inserting electronic components into a printed circuit board has a hand having a reference position and a hole formed at a predetermined distance from a target mark. It consists of a plate and a sensor that measures the target mark. When an electronic component lead is inserted into a hole, the sensor measures the displacement and inclination of the target mark on the plate and corrects the reference position of the hand.

For this reason, the external shape of the electronic component and the position of the lead can be easily measured, and as a result, the position of the hand can be corrected, so that the electronic component can be mounted on the printed circuit board with high precision. In addition, the external shapes and lead positions of various electronic components,
and accuracy.

(Example) Hereinafter, the present invention will be described with reference to an example shown in FIGS. 1 to 3. FIG. 1 is an overall structural diagram of a component chuck posture detection method for an automatic mounting machine showing an embodiment of the present invention, and FIG.
b) (0) shows a plan view and a sectional view of the plate used in the above. FIG. 3 is a diagram showing the changing position of the plate. 1st
In the figure, a hand 1 has a chuck 2 and an electronic component 3.
Open and close in the X direction to grab. Note that hand l is the reference axis A.
has been decided. A plate 5 having target marks 4 has holes 9 (hereinafter referred to as holes) formed at predetermined intervals on the top surface of a housing 8 of a measuring device 50 that measures the mutual position of an external shape 6 of an electronic component and a lead 7, and has target marks. 4
is supported on the lower surface via an elastic body 10. A sensor 11 is provided under the plate 5, and the target mark 4
is detecting the position of. Note that the sensor 11 in the case of Himuro uses a CCD two-dimensional camera. Further, the elastic body 10 is made of urethane foam and is moved by an external force, and returns to its original position when the external force is removed. The holes in plate 5 are shown in Figure 2 ((
As shown in (XO), both LX and LY are spaced at 1/10 inch intervals to match the lead spacing of the electronic component in a conical shape. A plurality of other stroke sensors may be used as the sensor.

The operation in this configuration will be explained.

The electronic component 3 is mounted on the printed circuit board by the chuck 2 of the hand 1, but before mounting, the external shape 6 of the electronic component and the mutual position of the lead 7 are measured by the measuring device 50. For this purpose, the hand 1 holding the electronic component 3 is positioned at a predetermined position on the plate 5 of the measuring instrument 50, and the lead 7 of the electronic component 3 is inserted into the hole 9 of the plate 5. At this time, when the lead 7 and the hole 9 match, the plate 5 remains in the same position without moving.

If the lead 7 and the hole 9 do not match, for example, Fig. 2 (0)
In such a case, the plate 5 moves in the X direction until the leads 7 and holes 9 coincide or the lateral forces are balanced.

At this time, as shown in FIG. 3, the sensor 11 measures the displacement amount (2:, #) and the inclination θ from the original target mark position a point to the displaced target mark position ib point. This measured displacement m<1,? ) and the inclination θ to the reference position A of the hand to correct the reference position. After correcting the reference position, the electronic component 3 is mounted on the printed circuit board.

In the above embodiment, two leads 7 of the electronic component 3 were inserted and measured, but one lead was inserted and measured, and the displacement 1It(:c,
/) may be corrected. Furthermore, although the holes in the plate 5 into which the leads 7 are inserted are spaced at 1/10 inches, they may be spaced in 1 mm increments depending on the electronic component. Furthermore, the holes may be spaced half in inches and half in millimeters. The elastic body lO that receives the plate 5 is made of urethane foam, but rubber,
A plurality of elastic bodies such as springs may be used to create the structure shown in FIG. 4, and the displacement amount may be received only in the lateral direction by the elastic body 12.

(Effects of the Invention) As described above, in the present invention, before inserting the electronic component into the printed circuit board, the external shape of the electronic component and the mutual position of the leads are measured, and the reference position of the hand is corrected based on the measurement results. This allows for accurate insertion into the printed circuit board. In addition, since a target position is set on the plate and the amount of movement of this target position is calculated by image processing, the field of view of the TV camera does not need to be narrow, and the burden on the image processing software is lightened, allowing the lead position to be determined quickly. The excellent effect of being able to measure the

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 (IX11) is a plan view and a sectional view showing a plate of the present invention,
FIG. 3 is a diagram showing the amount of displacement of the plate, FIG. 4 is a diagram showing a second embodiment of the plate support portion of the present invention, and FIG. 5 is a diagram showing the insertion of an electronic component into a printed circuit board. 1... Hand 2... Chuck 3... Electronic component 4... Target mark 5... Plate 6... External shape of electronic component 7... Lead 9... Hole IO... Elasticity Body 11...sensor

Claims (1)

[Claims] An automatic mounting machine that inserts electronic components onto a printed circuit board is made up of a hand with a reference position, a plate with a target mark and a hole formed at a predetermined interval, and a sensor that measures the target mark. A method for detecting the posture of an electronic component chuck in an automatic mounting machine, which is characterized in that when a lead is inserted into a hole, a sensor measures the amount of displacement and inclination of a target mark on a plate, and corrects the reference position of the hand.