JPS61122788A - Leading position detector of electronic parts - Google Patents

Abstract

PURPOSE:To determine the position of an electronic parts easily by previously storing a standard position from a reference point in an area including only a specific pattern, calculating the reference point from projection data obtained by image pickup and setting the area from the stored value. CONSTITUTION:An output from an image pickup device 1 is inputted to a projecting circuit 11 through a binary-coding circuit 2 to obtain projection data 21, 22 in the (x) and (y) directions. A reference point calculating circuit 12 calculates a reference point A to be an end point from the projection data 21, 22. A standard distance (r) and a standard angle have been registered in a standard distance/angle storing circuit 14 so that a lead to be detected is included and other leads are not included and a search area setting circuit 13 reads out the standard distance (r) and angle to set a search area 23. In the area 23, a pattern matching circuit 4 matches data read out from a standard pattern storage circuit 3 with its corresponding pattern to detect a position representing the 1st lead.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic component lead position detection device used when electronic components are mounted on a printed circuit board.

Conventional technology In recent years, small electronic components with multiple leads have been used for high-density mounting on printed circuit boards used in electronic devices, and electronic component lead position detection devices that can position them with high precision have become important. Ta.

Hereinafter, the conventional electronic component lead position detection device as described above will be explained with reference to the drawings.

FIG. 4 shows the configuration of a conventional electronic component position detection device. In FIG. 1, (1) is an imaging device, (2) is a binarization circuit that binarizes the video imaged by the imaging device (1), (3) is a standard pattern storage circuit that stores a standard pattern, (4) is a pattern matching circuit, and (5) is an electronic component of the object.

The operation of the electronic component position detection device configured as described above will be described below.

First, the imaging device fl) images the electronic component (5). The captured video signal is input to the binarization circuit (2) and exchanged into a binarized signal. The binarized signal is input to a pattern matching circuit (4), which performs pattern matching with a pre-stored partial standard pattern of electronic components (5+) to detect and output the position of the electronic component (5). .

This situation will be further explained with reference to FIG.

When the image capture screen captured by the image capture device (1) and binarized by the binarization circuit (2) looks like (6), the standard pattern (7) is used to move from the top left of the image capture screen (6) to the right. When the degree of coincidence is measured pixel by pixel all the way to the bottom, the degree of coincidence is highest at point (8), and its coordinates are detected and output as a position representative of electronic component (5).

While the invention seeks to solve the problem in conventional configurations, e.g.
In the case of electronic components with many leads, such as the one shown in the figure, there will be multiple patterns with the same shape, and the point with the highest degree of matching will not necessarily be the recognition point. It has the disadvantage that it is difficult to detect the position.

Structure of the Invention The present invention provides an imaging device, a circuit that binarizes an image of an electronic component lead imaged by the imaging device, and a projection device that projects a white or black portion of a signal from the binarization circuit in the X direction and the y direction. a projection circuit that creates data; a reference point calculation circuit that calculates a certain point on the imaging screen as a reference point from the projection data; a standard distance and angle storage circuit that stores a standard distance and angle from the reference point to the search area; A search area setting circuit that sets a search area from the reference point calculation circuit and the standard distance angle storage circuit, a standard pattern storage circuit that stores the standard pattern, and pattern matching using the standard pattern within the search area of the search area setting circuit. It consists of a pattern matching circuit that performs

Operation The present invention provides a projection circuit and a projection data Qυ for creating projection data Qυ of a binarized signal in the A reference point calculation circuit that calculates the coordinates of the reference point A from the end points of , ■, a standard distance and angle storage circuit that registers a standard distance r and angle θ so that it includes the lead to be detected in advance and excludes other leads; A search area setting circuit is provided to set a search area from the reference point calculation circuit and the standard distance angle storage circuit, and pattern matching is performed within the search area using the standard pattern of the standard pattern storage circuit that stores the standard pattern, and the same shape The position of one of the lead patterns can be detected.

Example Figure 1 is an actual diagram of the electronic component position detection device of the present invention. The configuration of the example is shown by blocks °°-.

In the figure, the same reference numerals as in FIGS. 4 and 5 indicate the same parts and parts.

αυ is a projection circuit that projects binary data in the X direction and y′ direction, α2 is a reference point calculation circuit that calculates a certain reference point within the imaging screen from the projection data, and α1 is a search area for pattern matching. Search area setting circuit,
I indicates a standard distance and angle storage circuit that stores standard distances and angles from the reference point to the search area.

The operation of the electronic component lead position detection device of the present invention will be explained. First, the electronic component (5) is imaged by the imaging device (1). The captured video is binarized by a binarization circuit (2), and the binarized signal is input to the projection circuit αυ.

In the projection circuit αυ, as shown in FIG. 2, projection data 011 in the X direction and projection data (2) in the y direction are created.

In this figure, the wire indicates a binary image of the captured image. The reference point calculation circuit α2 calculates the projection data c! From the end points of 〃 and (2), calculate the coordinates of the reference point A as shown in the figure.

Next, the search area setting circuit α3 reads out the standard distance r and angle θ, which are registered in advance in the standard distance angle storage circuit so as to include the lead to be detected and exclude other leads, and uses the point A as a reference. Set the search area (c) to . When pattern matching is performed using the standard pattern shown in FIG. 3(B) in the search area @ of FIG. 3(A), a position Q4 representing the first lead of this electronic component can be detected.

As described above, according to this embodiment, a reference point of an electronic component is detected from projection data, and a plurality of electronic components having the same shape are detected from standard distances and angles based on the reference point. By setting a search area to include only the leads to be detected among the leads and performing pattern matching within the search area, it is possible to accurately detect the position of the lead to be detected among the leads of the electronic component.

In this example, the search area is set to a fixed size, but the size can be set according to the target object, registered in the standard distance and angle memory circuit, and the value can be read out and searched when performing position detection. You may also set an area.

Effects of the Invention The present invention binarizes an image captured by an imaging device, and
Means for creating projection data in the X direction and Y direction from the converted signal; Means for calculating a reference point on the imaging screen from the projection data; and Setting a search area from standard distances and angles based on the reference point. The means and the means for pattern matching within the search area produce a practical effect in which a specific lead position of an electronic component in which a plurality of leads of the same shape are present can be easily detected.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the configuration of an embodiment of the electronic component lead position detection device of the present invention, FIG. 2 is a diagram for explaining projection data, FIG. 3 is a diagram for explaining the search area, and (A) is a diagram for explaining the search area. area, (b) is a standard pattern, Fig. 4 is a configuration diagram of a conventional electronic component detection device, Fig. 5 is a diagram for explaining the conventional example, p) is an imaging screen, and (b) is a standard pattern. show. Imaging device 2: Binarization circuit 3: Standard pattern storage circuit 4: Pattern matching circuit 5: Electronic components
6: Imaging screen 7: Standard pattern 8: Pixel portion with the best match 11: Projection circuit [2: Reference point calculation circuit 13: Search area setting circuit 14: Standard distance and angle storage circuit Patent applicant Matsushita Electric Industrial Co., Ltd. Agent Patent attorney Isao Abe (a) Figure 3 f) Figure 5

Claims (1)

[Claims] an imaging device, a circuit that binarizes an image of an electronic component lead imaged by the imaging device, a projection circuit that projects the white or black portion of the signal of the binarization circuit in the x direction and the y direction to create projection data; A reference point calculation circuit that calculates a certain point on the imaging screen as a reference point from the projection data, a standard distance and angle storage circuit that stores a standard distance and angle from the reference point to the search area, and the reference point calculation circuit and standard An electronic component comprising a search area setting circuit that sets a search area from a distance and angle storage circuit, a standard pattern storage circuit that stores a standard pattern, and a pattern matching circuit that performs pattern matching using the standard pattern within the search area of the search area setting circuit. Lead position detection device.