JPS60150689A - Device for correcting position of printed board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a position correction device for positioning a pattern on a printed circuit board.

[Prior art]

FIG. 1 is an explanatory diagram showing a conventional device, and in the figure, +1
1 is a printed circuit board, (2) is a printed circuit board land, (3
) is a through hole, (41#: is a light emitting source, (5) is an optical system, and the light emitting source (4) and optical system are collectively referred to as a light source device.

(6) shows the light receiving device, and (7) shows the central axis of the irradiated light beam.

Assuming that the positions of the light source devices f4), (5) and the light receiving device (6) are fixed, the printed circuit board (1) can be moved in the X-axis direction and the Y-axis direction at right angles to each other. (not shown). Printed circuit board (1
) is output from a calculator or other device, and the position of the table on which the printed circuit board (1) is mounted is controlled according to this value, and the table is driven until it reaches the relative position shown in Figure 1. . However, with such position control alone, it is not possible to precisely position the central axis (7) of the irradiation light beam so that it is accurately positioned at the center of the through hole.

For such precise positioning, it is necessary to
automatic position correction by scanning is required.

Figures 2 and 3 show the light receiving device f for automatic position correction.
Fig. 2 is an explanatory diagram showing the scanning performed in step (6), and Fig. 2 schematically shows the relationship when the light receiving device (6) is viewed from the direction of the central axis (7) of the irradiation light beam, and the example shown in the figure. In this case, the light receiving device (6) has four light sensors (61), (62), (63).
.

(64), and the light receiving area of each optical sensor is assumed to be within the area of each circle. Each optical sensor has a central axis (7)
The optical sensors (61) and (63) are arranged at positions having a predetermined deviation from the central axis (7), and the optical sensors (62) and (64) ) are arranged so that their positions on the Y axis are symmetrical with respect to the central axis (7). The center of the through hole (3) is the central axis (
7), a dotted circle (70) appears in Figure 2 if it matches exactly.
Since the light beam in the range represented by passes through the through hole (3) and enters the light receiving device (6), the intensity of the light received by each optical sensor is the same. Through hole (3)
If the center of the hole does not coincide with the central axis (7), the light beam will not poison any part other than the through hole (3), so for example, the light beam will not penetrate the area shown by the solid line circle (71) in Figure 2. The beam enters the light receiving device (6), and the light received by each optical sensor corresponds to the shaded area in FIG. Therefore, the output of each optical sensor is different. In such a state, the optical sensor is (61) → (62) → (63) → (64) →
If the switching is performed periodically in the order of (61)→, the output changes as shown in FIG. 3, for example. In Fig. 3, (sl), (sz), (sa), and (s4) are optical sensors (61), (62), (63), and (6), respectively.
4), to-+t□.

t□→12.1. , →t3. t3 → t4 (t4 is to of the next cycle) is the output of each optical sensor (81),
(82).

It shows the time to output (83) and (84).

The table on which the printed circuit board is mounted is driven in the X-axis direction so that the difference between outputs (81) and (83) becomes zero.
Change the above table to Y so that the difference between 2) and (84) is zero.
By driving in the axial direction, the center of the through hole (3) can be accurately aligned with the central axis (7).

In the example shown in Figure 2, four optical sensors are provided and the output of each optical sensor is used.
A similar effect can be obtained by periodically moving the optical sensor to the positions shown in (61), (62), (63), and (64). ), a similar effect can be obtained by moving the central axis (7) of the irradiation light beam. Since such scanning is well known in the past, a detailed explanation will be omitted, but in general, the light source device +41, (51, through hole (3), light receiving device (
The purpose of automatic position correction can be achieved by providing a scanning device for providing relative position deviations that are periodically repeated in a predetermined manner around the center value of the relative position in relation to the relative position 6).

Since the conventional device is configured as described above, it has the disadvantage that automatic position correction can only be performed for the position of the through hole.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above. In this invention, light is irradiated from the pattern surface side and the reflected light is input to the light receiving device to perform automatic position correction. It was made so that it could be done.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is an explanatory diagram showing an embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same or Buddhist parts, and since they operate in the same way, redundant explanation will be omitted. In FIG. 4, (8) shows the pattern of the printed circuit board, and (9) shows the central axis of the reflected light beam when the irradiated light beam is reflected by the pattern (8). Scanning by the light receiving device (61 or optical system (5)),
The error signal detected by this scanning causes a shift pattern (8
) is also controlled in the same way as explained in relation to Fig. 1, but in the case of Fig. 4, the relative positions of the pattern (8), the light source device (41, f51, and the light receiving device (6)) are When the patterns precisely match the predetermined relative positions, the output of the light receiving device (6) does not change even if scanning is performed, but only the position of the pattern (8) deviates slightly from such relative positions. In this case, when scanning is performed, the light received by the reflected light beam - #CIf (the output of 61 fluctuates in synchronization with the scanning, and the position of pattern (8) is controlled by feedback l+i in the direction in which this fluctuation disappears. can be automatically corrected.

According to the device shown in FIG. 4, the difference in reflectance to light between the part where the pattern (8) is present and the part where the pattern (8) is not present on the printed circuit board (1) is used, so the boundary between the pattern (8) The position can be automatically corrected at any prominent location, and when you want to use the through hole (3), the position can be automatically corrected by using the reflected light from the printed circuit board land (2). It can be performed.

〔Effect of the invention〕

As described above, according to the present invention, light is emitted from the patterned surface of the printed circuit board and scanning is performed on the reflected light. This has the advantage that automatic correction can be performed using the position of .

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing a conventional device, Fig. 2 is an explanatory diagram showing scanning in the light receiving device shown in Fig. 1, and Fig. 3 shows a signal output from the light receiving device in the case of scanning shown in Fig. 2. 4 are explanatory diagrams showing an embodiment of the present invention. (1)...Printed board, (2)...Printed board land, (3)...Through hole, +41, (5
1... Light source device, (6)... Light receiving device, (8)...
·pattern. In each figure, the same reference numerals represent the same or corresponding parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A light source device for irradiating a desired pattern position on a printed circuit board, a light receiving device provided at a position where the light beam emitted from the light source device is reflected at the pattern position and enters the pattern position, the light receiving device, the pattern position, and the light source. A scanning device that provides a relative position deviation that is periodically repeated in a predetermined manner around the center value of the relative position with respect to the relative position between the device and the light receiving device; means for decomposing the amplitude modulation generated in the output of the output into two mutually perpendicular axial error components, and driving the printed circuit board by the mutually perpendicular two axial error components to reduce the error in the two axial directions. A printed circuit board position correction device equipped with feedback control Mlt that controls so that both components become zero.