JPH01257849A - Aligning device for printed board with mask - Google Patents

Abstract

PURPOSE:To enable accurate aligning at low facility cost with simple constitution by providing a movable aligning pin for a printed board which is supported movably by an elastic body and can be shifted forcibly in position from outside. CONSTITUTION:When the pin part 1a of the movable pin 1 is fitted fixedly in the hole of the printed board against the elastic force of the elastic body 2, the movable pin 1 is set at the center position of the printed board with the elastic force of the elastic body 2 while put close to an original center position, so the center position of the printed board is aligned with the center position of the mask. At this time, when the center position of the printed board needs to be aligned with the center position of the mask more accurately, the movable pin 1 is inserted into a V groove 1c through a hole 6a from outside and thus shifted forcibly in position. Consequently, the high accuracy aligning is performed at low cost with the simple constitution.

Description

[Detailed Description of the Invention] [Industrial Application Field] - The present invention relates to a device for aligning a printed circuit board and a mask in an exposure process, and is particularly suitable for aligning a printed circuit board and a mask in a high-density mounting board. The present invention relates to a mask alignment device.

[Conventional technology]

Conventionally, the method of positioning using positioning pins is as described in, for example, "Jig/Fixture Handbook, pages 49 to 51," published by Asakura Shoten on April 20, 1970. A method using pins is introduced.

Regarding the alignment of the mask and the substrate, for example, Japanese Patent Laid-Open No. 62-224025 and Japanese Patent Laid-Open No. 62-2
As described in Publication No. 24026.

A method using a COD camera and an aligner has been proposed.

[Problem to be solved by the invention]

In the former prior art 2 above, two or three fixing pins are used to fix the board, so in the case of two fixing pins, which one is one fixing pin and which is six fixing pins? In this case, any one or two fixing pins tend to serve as a reference, so there is a problem in that the mask and the substrate cannot be easily aligned.

There is also a method of fixing the mask and the substrate using the same fixing pin, but with this method, the five substrates may not fit into the pins because both the substrate and the mask expand and contract a lot.
Since the mask holes are scratched by the fixing pins, the gap between the fixing pins and the holes formed in the substrate and the mask is made large in advance, and the mask is used in a state where the fixing pins and holes are in a "wobbly" state.

As described above, in the former prior art described above, no consideration was given to expansion and contraction of the substrate during center alignment, and it was unsuitable for highly accurate alignment.

Furthermore, the latter conventional technique has a problem that the configuration is complicated and the equipment cost is high.

SUMMARY OF THE INVENTION In order to solve the problems of the prior art described above, an object of the present invention is to provide a printed circuit board and mask alignment device that has a simple configuration and enables precise alignment at low equipment costs.

[Means to solve the problem]

In order to achieve the above object, in the present invention, in a printed circuit board and mask alignment device that aligns a printed circuit board to the center position of a mask that has been positioned at a predetermined position in advance, movable support is provided using an elastic body. is,
In addition, a movable pin for positioning the printed circuit board configured to be forcibly moved from the outside is provided.

Further, a mask positioning fixing pin configured to firmly fit into the positioning hole of the mask and loosely fit into the positioning hole of the printed circuit board is provided.

Also, firmly fit the movable pin into the positioning hole for the printed circuit board,
It is configured to loosely fit into the positioning hole of the mask.

[Effect]

The printed circuit board configured as described above and the movable pin of the mask alignment device are firmly fitted into the holes of the printed circuit board that expanded and contracted in the previous process while moving slightly, and then returned to the original state by the elastic force of the elastic body. By this action and being forcibly moved from the outside, the center position of the printed circuit board can be held constant regardless of expansion and contraction.

In addition, after positioning the center position of the mask by firmly fitting the mask hole into a fixed pin sized to loosely fit into the hole in the printed circuit board, a movable pin sized to loosely fit into the mask hole is slightly moved using an elastic body. When the movable pin is firmly fitted into the hole of the printed circuit board, the elastic body acts to return the movable pin to its original position, and by forcibly moving the position of the movable pin from the outside, the center position of the printed circuit board can be expanded and contracted. It can be held at the center of the mask regardless of the location.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be explained below with reference to FIG.

As shown in FIG. 1, a support plate 6 is fastened with a set screw 5 to an exposure table 4 made of an acrylic plate or the like. This support plate 6 has a hole 6α passing through it in the center, and the movable pin 1 is interposed between the upper surface of the hole 6α and the pin guide 3 which is fastened to the upper surface with a set screw 7 so as to be movable in the horizontal direction. It is inserted and supported. This movable pin 1 has a pin portion 1cL that is firmly fitted into a hole (not shown) in a printed circuit board (not shown) at a portion of its upper end that protrudes from the top surface of the exposure table 4, and a solid shaft portion thereof. A groove 18 into which the ring-shaped elastic body 2 is inserted is formed, and a V-groove 1G is formed in the lower end surface. Since the outer peripheral surface of the elastic body 2 is in contact with the inner peripheral surface of the hole 3α of the pin guide 3, the elastic force of the elastic body 2 normally holds the movable pin 1 at the center position of the hole 36L. . Although not shown, a mask whose center position has been determined in advance is placed on the exposure table 4 before the printed circuit board is placed thereon.

Next, the alignment operation of the printed circuit board will be explained.

In a normal process, when a printed circuit board that has expanded and contracted due to the mounting of electronic components, etc. is placed on a pre-positioned mask, the pin portion 1α of the movable pin 1 hits the elastic force of the elastic body 2, causing the printed circuit board to move slightly. When the movable pin 1 is firmly fitted into the hole, the elastic force of the elastic body 2 moves the movable pin 1 to the original center position and positions the center of the printed circuit board, so that the center of the printed circuit board is aligned with the center of the mask. Ru.

At this time, if it is necessary to more accurately align the center position of the printed circuit board with the center position of the mask, insert it from the outside into the V-groove 1c through the hole δα, and insert the movable pin 1
By forcibly moving the position of the mask, the printed circuit board and the mask can be aligned.

Next, a description will be given of FIGS. 2 and 3 showing the case where the present invention is applied to a printed circuit board for an exposure process and a mask mounting device.

As shown in FIG. 2, the heads of a plurality of fixing pins 9 (two in FIG. A plurality of (two in the figure) movable pins 1 are movably installed by an elastic body 2. Each of the plurality of fixing pins 9 is a printed circuit board.

Hole 11 of two masks 10 arranged on both upper and lower sides of mask 12
α, and the hole 16α of the printed circuit board 12 shown in FIG.
It is sized to fit loosely into the The pin portion 1α of the movable pin 1 is formed in a size that allows it to loosely fit into the holes 11/L of the two masks 10 and to fit securely into the hole 154 of the printed circuit board 12. Further, on the upper surface of the upper mask 10, an upper plate 8b for exposure is arranged. The upper plate 84 for exposure is formed of an acrylic plate or the like, and has grooves 14α formed in its lower surface into which the tips of the fixed pins 9 and the tips of the pin portions 1α of the movable pins 1 are loosely fitted, and the outer periphery of the grooves 14α are formed. and lower plate for exposure 8cL
The printed circuit board 12 is inserted by inserting a notch 15 between the
and two masks 10 are sealed.

Next, the alignment and mounting operations of the printed circuit board 12 and the mask 10 will be explained.

First, the lower mask 10 whose central position is determined by loosely fitting the movable pin 1 and firmly fitting the fixed pin 9 is placed on the lower exposure plate BcL.

Next, the fixing pin 9 is loosely fitted into the hole 13α of the printed circuit board 12 which has been expanded and contracted in the previous process on the lower mask 10, 8.

Then, the pin portion ia of the movable pin 1 is firmly fitted and placed in the hole 13-er while being slightly moved in the horizontal direction. At this time, due to the expansion and contraction of the printed circuit board 12, if the movable pins firmly fitted in the holes 13k are located at eccentric positions, the plurality of movable pins 1 are moved toward each other in the left and right direction by the elastic force of the elastic body 20, and the printed circuit board 12, the center of the printed circuit board 12 is aligned with the center of the mask 10 below. If more precise alignment is required, insert the V-groove 1G from the outside through the hole 6cL.
By inserting the movable pin 1 into the inside and forcibly moving the position of the movable pin 1, the printed circuit board 12 can be aligned with the mask 10 below with high precision.

Then, like the lower mask 10, the upper mask 10 is loosely fitted onto the movable pin 1, and firmly fitted onto the fixed pin 9, thereby positioning the printed circuit board 12 with its center position determined.
is placed on the top surface of the

Next, the upper plate for exposure is placed on the upper mask 10, and the banking 15 is inserted between the upper surface of the lower plate for exposure 8a, thereby removing the printed circuit board 12 and the mask 10.
is sealed.

Therefore, the printed circuit board 12 and the two masks 10 can be aligned and attached at the same time.

Furthermore, with conventional alignment devices, the limit was alignment accuracy of approximately ±0.1 mm, but with the present invention, ±
Q. Accuracy of about 0.5 mm can be maintained.

〔Effect of the invention〕

According to the present invention, it is possible to align the printed circuit board and the mask with a simple configuration, low cost, and high precision.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an alignment device for a printed circuit board and a mask, which is an embodiment of the present invention, and FIG. 2 is a sectional view showing an exposure process printed circuit board and mask mounting device, which is another embodiment of the invention. The sectional view and FIG. 6 are plan views of the printed circuit board. 1... Movable pin, 2... Elastic body 3... Pin guide, 4... Exposure table. 8... Upper and lower plates for exposure, 9... Fixing pin. 10... Mask, 12... Printed circuit board, 15...
・Banking.

Claims (3)

[Claims] 1. In a printed circuit board and mask alignment device that aligns the center position of a printed circuit board placed on the mask with the center position of a mask that has been positioned at a predetermined position in advance, a , and a printed circuit board and mask positioning device provided with a movable pin for positioning the printed circuit board configured to be forcibly moved from the outside. 2. 2. The printed circuit board and mask positioning device according to claim 1, further comprising a mask positioning fixing pin configured to firmly fit into the positioning hole of the mask and loosely fit into the positioning hole of the printed circuit board. 3. 2. The printed circuit board and mask positioning device according to claim 1, wherein the movable pin is firmly fitted into the printed circuit board positioning hole and loosely fitted into the mask positioning hole.