JPH0752099B2 - Parts positioning method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention has leads protruding from a main body such as an IC, and positioning of the leads is more important than positioning of the main body itself. The present invention relates to a positioning method and a positioning device for parts.

[Prior Art] In recent years, most electronic components can be automatically mounted, which greatly contributes to improvement in productivity. When mounting automatically, if it is a component such as an IC,
This is achieved by finding the center of gravity of the IC and moving the data of the center of gravity to the position where the IC should be attached.

[Problems to be solved by the invention] However, ICs of recent years are often required to have various functions combined, and even if the package has the same shape as the conventional IC, the number of leads is greater than that of the conventional IC. The number of leads is very short, and thus the lead interval is short, and strict mounting accuracy is required. However, since the relative error between the package and the lead of the IC is the same as before, there is a problem that the positioning accuracy of the lead portion may not satisfy the required value when the positioning is performed with the dimensional accuracy of the package.

[Means for Solving the Problem] In order to solve such a problem, the first invention provides a window in a state of intersecting with all portions protruding from an object to be measured, and respective portions intersecting in the window. Is a method of independently determining the center of gravity of the, determining the average value of the obtained center of gravity, and positioning the average value as the center of the measurement target,
The second invention is the device.

[Operation] Since the center of gravity of each lead is obtained independently, and the center position of the package mainly including the lead is obtained by obtaining the average value thereof, accurate positioning is performed based on that value.

[Embodiment] FIG. 2 is a block diagram of a component mounting apparatus configured by applying the present invention. The arm 2 holding IC1 by a method such as suction is moved to bring IC1 into the field of view of the window generator 3. When placed, the leads on each side of IC1 will pass through CCD 3b through lens 3a.
Taken by 3e. These CCDs are provided at positions corresponding to the IC leads, and the X and Y coordinates are swept by the address counter 41a of the center-of-gravity measuring device 4, and the image signal of the portion corresponding to the swept coordinates is output. ing. Also, as shown in Fig. 1, these CCDs are parts that are sufficiently shorter than the length of the leads and project from each side of the object to be measured. It has become.

The center-of-gravity measuring device 4, as representatively shown for one circuit, is C
The image signal output from the CD is processed by the image processing device 41b, and the center of gravity of the lead crossing the window is independently obtained from the image signal taken.

The center of gravity of each lead intersect read each and the window of the respective sides of A~D of IC1 as shown in FIG. 1, the center of gravity a ₁ ~ intersection independently for each lead in each of the window
a _n , b _{1 to} b _n , c _{1 to} c _n , d _{1 to} d _n are obtained. Where for example a
₁ is represented by coordinates (Xa ₁ , Ya ₁ ), and the same applies to other coordinates. When the center of gravity of each lead is independently obtained in this manner, the center of the package mainly including the lead is obtained by the average value calculation device 5 by the following equation.

Further, when the inclination of the IC is required, the inclinations of the straight lines between the centers of gravity a and b or the centers of gravity c and d may be obtained and averaged. For example, the slopes of the respective straight lines with respect to the centers of gravity a and b can be obtained as follows.

When the center of the package is obtained in this way, the setting device 6 sets the IC1 at the predetermined setting position based on the obtained value. This set position is based on the center position coordinates of the package. Since the center position coordinates are the values obtained from the lead information, the leads can be positioned accurately by positioning the package. become.

FIG. 3 is an application of this method to a method for obtaining the center of gravity of a symmetrical object. According to this method, four windows A to D are applied to the object to be measured 10, and the center of gravity of the symmetrical object 10 to be measured can be obtained by the above-mentioned calculation based on the centers of gravity a to d obtained from the respective windows. .

The number of windows may be the same as the number of sides of the measurement target.

[Effects of the Invention] As described above, according to the present invention, the portion protruding from the measurement object intersects the window, and the center of the measurement object is obtained from the center of gravity of the intersection.
Accurate positioning can be performed mainly by the protrusion, and the protrusion is the IC
In the case of the lead, the lead can be accurately positioned.

[Brief description of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a block diagram of its application device, and FIG. 3 is a diagram showing another embodiment. 1 ... IC, 2 ... arm, 3 ... window generator, 4
…… Center of gravity measuring device, 5 …… Average value measuring device, 6 …… Setting device.

Claims (2)

[Claims] 1. A window is provided in a state of protruding from the main body and intersecting a portion to be measured, and the center of gravity of each of the intersecting portions in the window is independently determined, and the average value of the determined center of gravity is determined and this average value is calculated. Positioning method for positioning parts with the center of the body. 2. A window generating device which is provided with a window so as to project from the main body and intersect with a portion to be measured, and a center of gravity measuring device which independently obtains the center of gravity of each portion intersecting with this window. An apparatus for locating components, which includes an average value calculating device for obtaining the average value of the center of gravity of the and a setting device for setting the main body at a predetermined position based on the average value.