JPH0697612A - Printed wiring board - Google Patents

Abstract

PURPOSE:To prevent the error of the flow direction of a printed wiring board, before happens by forming recognition marks in the manner in which, in the vicinity of the end surface or at the ear part position of a printed wiring board, the position of point symmetry from the center of the printed wiring board is set as a reference, and the position of one recognition mark is shifted by specified times the recognition mark area from the reference. CONSTITUTION:Recognition marks 3a, 3b on the surface (a) and recognition marks 3c, 3d on the rear (b) are formed in the vicinity of the end surface of a printed wiring board 1 in the following manner. The position of point symmetry from the center of the printed wiring board is set as a reference. The one mark 3a out of the two recognition marks 3a, 3b or the one recognition mark 3c out of the two recognition marks 3c, 3d is formed at a position shifted by three times the recognition mark from the reference. The recognition marks 3c, 3d are formed at positions of the rear (b) which positions are seen by looking through the recognition marks 3a, 3b on the surface (a). Thereby the error of the flow direction of the printed board is prevented, and the fault that a surface mount parts is packaged while the flow direction is mistaken as it is can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board for automatically mounting surface mounting components by an automatic mounting machine, and particularly, for recognizing an image by a recognition device arranged in the component mounting machine,
The present invention relates to a printed wiring board having a recognition mark for position correction.

[0002]

2. Description of the Related Art When a surface mount component is automatically mounted on a printed wiring board, the surface mount component is mounted by fixing the printed wiring board by an end face or a pin hole on a conveyor of a component mounting machine. Recently, recognition marks have been used to improve mounting accuracy.

As shown in FIGS. 2 and 3, the conventional recognition mark has two recognition marks formed at positions symmetrical with respect to the center of the printed wiring board. That is, in FIG. 2, the recognition marks 4a and 4a are formed on the surface (a) of the printed wiring board.
b is formed, and recognition marks 4c and 4d are formed on the back surface (b) at positions different from the front surface (a).

In FIG. 3, recognition marks 5a and 5b are formed on the front surface (a) of the printed wiring board, and recognition marks 5c and 5c are formed on the back surface (b) at the same positions as the front surface (a).
d is formed.

These printed wiring boards are set in a stacking stocker and flow through a surface mounting line (cream solder printing, component mounting machine, reflow oven). Next, change the direction to the back side of the printed wiring board and set it on the stacking stocker, and let the surface mounting line flow.

[0006]

Problems to be Solved by the Invention Conventionally, when the printed wiring boards were set on the stacking stocker, the printed wiring boards may be rotated or reversed, and the surface mounting line may be misdirected. .

When the flow direction is wrongly set in the stacking stocker, the printed wiring board is subjected to cream solder printing and surface mounting component mounting while the flow direction is different, and is soldered in the reflow furnace. That is, the surface-mounted component is mounted while the flowing direction is different, resulting in a defect.

When the printed wiring board is fixed by the end face or the pin hole to mount the surface mount component, it is not possible to prevent a defect due to a mistake in the flow direction of the printed wiring board because it has no recognition function.

Further, when the conventional recognition marks as shown in FIGS. 2 and 3 are image-recognized to mount the surface mount component, there is a problem that the recognition marks of the printed wiring board overlap each other. It is impossible to prevent defects due to mistakes in the flow direction.

Recognition marks 4a, 4b, 4c and 4d shown in FIG.
In, the front surface (a) and the back surface (b) of the printed wiring board 1
When each is rotated, the recognition marks 4a and 4
b and the recognition marks 4c and 4d overlap on the back surface (b). Further, when the front surface (a) and the back surface (b) are compared, the recognition marks 4a and 4c, 4b and 4d overlap each other.

Next, the recognition marks 5a, 5b and 5 shown in FIG.
Also in c and 5d, the recognition marks 5a and 5b on the front surface (a) and the recognition marks 5c and 5d on the back surface (b) as in FIG.
And overlap. That is, if the recognition marks are overlapped, it means that the recognition direction is correct even if the recognition mark is recognized by the recognition device when the recognition direction is wrong. Will be.

The present invention has been made in view of the above problems, and an object thereof is to provide a printed wiring board having a recognition mark capable of preventing a mistake in the flowing direction of the printed wiring board.

[0013]

[Means for Solving the Problems] In order to solve the above problems, the means adopted by the present invention is "in a printed wiring board having a recognition mark for performing position correction using an image recognition device. , Near the end face of the printed wiring board, or at the position of the ear, with reference to the position of point symmetry from the center of the printed wiring board, the position of one of the two recognition marks is the area of the recognition mark based on the reference. 2 to 10
A printed wiring board, wherein the two recognition marks are formed in a doubled position, and two recognition marks are formed at a position on the back side of the printed wiring board seen through the two recognition marks. "
Is.

[0014]

According to the present invention, by adopting the means as described above, when the recognition mark is recognized by the recognition device when the printed wiring board is misoriented in the flowing direction, the recognition mark is overlapped on the printed wiring board. Since there is no recognition mark, the recognition device judges that there is a recognition error and the component mounting machine stops, so it is possible to prevent the printed wiring board from being mistaken in the flowing direction.

【Example】

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a plan view showing a recognition mark according to the present invention, where (a) is the front surface of the printed wiring board 1 and (b) is the back surface obtained by turning the front surface (a) over along the line AA.

The recognition marks 3a, 3b on the front surface (a) and the recognition marks 3c, 3d on the back surface (b) are located near the end surface of the printed wiring board 1 with reference to a point symmetrical position from the center 2 of the printed wiring board. Individual recognition marks 3a, 3b, or 3
The position of one of the recognition marks 3a or 3c among c and 3d is formed by being shifted to a position which is three times the area of the recognition mark from the reference, and the recognition marks 3a and 3b on the surface (a) are seen through. Recognition marks 3c and 3d are formed on the back surface (b).

Therefore, when the printed wiring boards 1 are set in the stacking stocker, even if the printed wiring boards 1 are rotated and the flow direction is wrong, the recognition marks 3a and 3 are recognized on the surface (a).
b does not overlap with the recognition mark 3 on the back surface (b).
That is, c and 3d do not overlap. Further, when the front surface (a) is inverted and compared with the back surface (b), the recognition mark 3
That is, a and 3c, 3b and 3d do not overlap each other.

That is, since the recognition marks do not overlap with each other, even if the printed wiring board is misplaced in the flowing direction or the front and back, if the image recognition is performed using the recognition device arranged in the component mounting machine, it is judged as a recognition error and the component mounting is performed. When the machine stops, the flow direction of the printed wiring board and the mistake in the front and back can be recognized, and defects can be prevented in advance.

With respect to a point-symmetrical position from the center of the printed wiring board as a reference, one of the two recognition marks is formed by shifting the position of one of the recognition marks to a position which is 2 to 10 times the area of the recognition mark from the reference. However, the deviation position is a search area range of the recognition device when the recognition mark is used for image recognition by the recognition device, that is, a position other than a range in which the recognition mark to be the target of image recognition is searched, that is, the area of the recognition mark is 2
It shifts to the position of 10 times. Desirably, the area is 3 to 5 times the area of the recognition mark, and this makes it possible to completely prevent defects due to a mistake in the flow direction of the printed wiring board.

The recognition mark may be a copper foil pad, a solder-plated pad, a gold-plated pad, a through hole, or a bottomed hole by counterboring or the like. Further, the shape of the recognition mark may be a circle, a quadrangle, a triangle, a cross, or the like, and the shapes of the two recognition marks may be different from each other. Further, the position where the recognition mark is provided is not limited to the vicinity of the end surface of the printed wiring board, and may be provided at the ear (dummy substrate) of the printed wiring board.

As described above, according to the present invention, it is possible to prevent a mistake in the flow direction of the printed wiring board, so that it is possible to eliminate the defect that the surface mount component is mounted with the flow direction wrong.

[Brief description of drawings]

FIG. 1 is a plan view of a printed wiring board having a recognition mark of the present invention, (a) being the surface of the printed wiring board, and (b).
Is the back surface of the printed wiring board with the front surface (a) turned inside out along the line AA.

2A and 2B are plan views of a conventional printed wiring board having an identification mark, wherein FIG. 2A is a front surface of the printed wiring board, and FIG. 2B is a printed wiring board in which the surface (a) is turned upside down along the line BB. Back of

FIG. 3 is a plan view of a conventional printed wiring board having another recognition mark, where (a) is the surface of the printed wiring board;
(B) is the back surface of the printed wiring board in which the surface (a) is turned upside down along the line C-C.

[Explanation of symbols]

 1 printed wiring board 2 center of printed wiring board 3a recognition mark 3b recognition mark 3c recognition mark 3d recognition mark 4a recognition mark 4b recognition mark 4c recognition mark 4d recognition mark 5a recognition mark 5b recognition mark 5c recognition mark 5d recognition mark

Claims (1)

[Claims] 1. A printed wiring board having a recognition mark for position correction using an image recognition device, wherein a position of a point object from the center of the printed wiring board near the end face of the printed wiring board or at the position of the ear. Of the two recognition marks, the position of one of the recognition marks is shifted to a position that is 2 to 10 times the area of the recognition mark from the reference, and the two recognition marks are seen through. A printed wiring board having two recognition marks formed on the back side of the printed wiring board.