JP3152693B2 - Screen printing method and apparatus for electronic circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing method for forming a predetermined circuit pattern on an electronic circuit board, and an apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, formation of a predetermined circuit pattern or the like on an electronic circuit board (hereinafter referred to as "work") has provided relatively high precision. For this reason, it is often performed by a screen printing process. Therefore, in this screen printing method, it is necessary to perform the work alignment processing for positioning the work at a predetermined position and the printing processing for the positioned work at the same stage. Since the screen plate alignment and the printing process must be performed at the same time, the structure becomes complicated, so that the number of operating steps in one stage increases, and the formation of more precise patterns, etc. A problem that the realization of the system cannot be expected.

To solve this problem, paying attention to the fact that the screen plate fixing structure in the printing section is relatively simple, the work alignment section and the printing section are separately provided. In addition, a method is employed in which the work whose position has been aligned by the aligning unit is maintained as it is, and is conveyed to the printing unit to perform a printing process. In other words, the work position matching is performed by checking the verification contents of the work matching unit from the work position confirmation at the work matching unit to the instruction of the adjusting operation of the adjusting mechanism. It is to do.

As described above, it is relatively easy to fix the screen plate in the printing section. However, as is well known, the screen plate is fixed to a silk material stretched on a frame body. The printing pattern is formed by perforating the printing pattern, and elasticity is given so as to be able to cope with the skiing.
Frequently, the initial setting in the printing unit may change due to the temporal factors of the material itself. In fact, in a printing system of this type in which a work matching unit is separated, a printing system in which reconfirmation of the screen plate position in the printing unit must be periodically checked has appeared. In such a situation, the alignment of the work at the predetermined position at the alignment portion has no meaning at all, and the intervention of high-precision transport means becomes useless. . After all, in such a specification in which the verification content of only the work matching section is used in opposition, continuous and automatic printing processing is performed due to a change in the initial setting of the screen version in the printing section. In addition to the above, it is impossible to obtain accurate circuit patterns and the like.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned state of the prior art, and is based on a verification of the position of a screen plate detected by a printing unit. Adjusting the position of the work is a means for solving the problem.

[0006]

According to the present invention, the first detecting means for detecting and confirming the positional relationship of the screen plate in the printing section to be the opposition and transmitting the verification contents to the work matching section is provided in the printing section. The second detecting means is provided to receive the verification content from the first detecting means and to prompt the adjusting operation of the aligning and adjusting mechanism of the aligning section accordingly.
Since the detecting means is arranged in the matching section via the arithmetic adjusting means, the position of the work in the matching section always coincides with the position of the screen plate in the printing section. Therefore, even if the predetermined position in the printing portion of the screen plate changes with time, it is possible to adjust the position of the work accurately corresponding to the change in the position of the screen plate.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail based on the device structure.

The aligning section 1 and the printing section 2 are arranged in series, and the conveying means 3 is provided so as to be able to reciprocate through the aligning section 1 and the center of the printing section 2. The printing unit 2 includes a printing table.
It has a mounting frame 4 for the bull 2a and the screen plate S.
The printing table 2a is provided with a light-transmitting hole 5 through which a first detecting means 7 is connected to a screen plate S located above the printing table 2a. Verify the positional relationship. The transporting means 3, which moves through the center of the printing unit 2, that is, through the center of the printing table 2a, can also move through the aligning unit 1 as described above. The work W whose position has been aligned is conveyed to a predetermined position of the printing unit 2 as it is, but here, an integrated unit that can be moved up and down in multiple steps with respect to the surface of the alignment unit 1 and the printing unit 2 It is formed in.

The first detecting means 7 provided in the printing unit 2 is
The apparatus uses a CD camera, and is capable of moving forward and backward with respect to the transporting means 3 which moves through the center of the printing unit 2, that is, the center of the printing table 2a. This means that the positional relationship of the screen plate S can be quickly specified according to the size of the work W to be handled, and the reference portion formed near the end face of the screen plate S can be adjusted. The utility is that the targeted verification action can be expected. Targeting the reference portion near the end face of the screen S results in obtaining a higher accuracy verification result than verifying the center portion of the screen S or the reference portion in the vicinity thereof. Will be. The reference portion formed on the screen plate S may be a fixed mark or a through hole having a certain size.

The aligning section 1 comprises an aligning and adjusting mechanism 1a having a three-axis stage of .GAMMA., Y and .theta. As a main element, and a screen plate S of the first detecting means 7 of the printing section 2. And a second detecting means 8 for receiving the verification contents related to the positional relationship. The adjusting mechanism 1a having a triaxial stage as a main element includes:
The adjusting operation is performed by the second detecting means 8 which operates according to the contents of verification of the screen plate S of the first detecting means 7 of the printing unit 2. In short, the work W of the matching unit 1
Are received by the first detecting means 7 which has verified the positional relationship of the screen version S, and are matched by the second detecting means 8.

At this time, it goes without saying that the first detecting means 7 and the means 9 for calculating and adjusting the mutual positional relationship of the second detecting means 8 are interposed. By the operation of the means 9, it is possible to accurately and promptly instruct the matching section 1 on the verification contents of the first detecting means 7 of the printing section 2 with respect to the screen version S. The second detecting means 8 of the matching unit 1 also uses a CCD camera,
Can be moved forward and backward with respect to the central part. The fact that the second detecting means 8 is capable of moving forward and backward means that the transporting means 3
Can quickly respond to the difference in the size of the work W conveyed by the camera, and can expect a detection action targeting a reference portion near the end face of the work W. This means that the same effect as the effect obtained by the first detecting means 7 in the printing unit 2 moving forward and backward with respect to the center of the printing unit 2 can be obtained. In other words, it is possible to obtain more accurate verification contents than to verify the central portion of the work W or its vicinity. The reference portion formed near the end face of the work W may be a fixed mark or a through hole.

As is clear from the above description of the apparatus structure, the positional relationship of the screen plate S fixed to the mounting frame 4 of the printing unit 2 is always verified by the first detecting means 7, and the contents of the verification are as follows. , A computer as the arithmetic adjustment means 9
The signal is transmitted to the second detecting means 8 of the matching unit 1 via the rotator. Thus, the second detecting means 8 includes the printing unit 2
According to the contents of the verification in step (1), the position alignment of the work W of the aligning section 1 is instructed and realized by the adjusting mechanism 1a comprising a three-axis stage of χ, y, θ. Therefore, even if there is a temporal change in the initial setting of the screen version S, this change is immediately verified by the first detecting means 7 and matched via the computer device which is the arithmetic adjusting means 9. Part 1 second
And the position of the work W in the alignment unit 1 is immediately corrected to a position exactly corresponding to the change in the position of the screen plate S in the printing unit 2. become.
Thus, the work W whose position has been aligned is always in the alignment section 1.
Moving means 3 while maintaining the alignment state at
As a result, the sheet is conveyed to a predetermined position of the printing unit 2, that is, a predetermined position of the screen plate S of the printing unit 2. As a result, in the printing unit 2, the screen plate S and the work W always completely match, and the predetermined pattern of the screen plate S is printed accurately on the work. In the drawings, reference numerals 10 and 11 denote moving rollers for adjustment provided on the adjusting mechanism 1a.
Temporary positioning of the work W in the χ and y axis directions is performed.

[0013]

According to the present invention, as described above, the positional relationship of the screen plate in the printing unit under the cooperation of the first detecting unit provided in the printing unit and the second detecting unit provided in the matching unit. The purpose of this is to adjust the position of the work in the matching section based on the verification contents of the above. Inconvenience can now be easily resolved.

[Brief description of the drawings]

FIG. 1 is a schematic top view of an apparatus according to the present invention.

FIG. 2 is a partial cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Alignment part 1a Position adjustment mechanism 2 Printing part 2a Printing table 3 Conveying means 7 First detecting means 8 Second detecting means 9 Arithmetic adjusting means S Screen version W Work

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H05K 3/12 B41F 15/08

Claims (4)

(57) [Claims] 1. A work which has been aligned by a work aligning unit provided outside a printing unit, and a work is aligned in a predetermined position of the printing unit in the aligned state.
Transported to, subscription on the workpiece - in a screen printing method for an electronic circuit board which <br/> printed electronic circuit through the down plate, when verifying the alignment position of the workpiece at the alignment portion co
To, subscriptions in the printing unit - to verify the printing position of down version, it
Based on the contents of each verification, the work
The information relating to the respective positional relationships of the screen plates in the printing unit is confirmed , and the work position adjustment mechanism of the work alignment unit is controlled in accordance with the contents of the confirmation , and the work in the alignment unit is controlled .
A screen printing method for an electronic circuit board, wherein a matching position is adjusted . 2. A printing position of a screen plate in the printing unit.
Verification and the verification of the alignment position of the work in the alignment unit,
2. The method according to claim 1, wherein the detection is performed by using a CCD camera, and the detection is performed while targeting a reference portion formed near the end face of the screen plate and the work in the printing section and the matching section, respectively. Screen for electronic circuit board
Printing method. 3. A work which has been aligned by a work aligning unit provided outside the printing unit, and the work is aligned at a predetermined position in the printing unit.
Transported to, subscription to the work - first verifying the down plate printing position - in screen printing apparatus, subscriptions to the printing unit - Subscription to the substrate electronics to <br/> printed electronic circuit through the down plate And a second detecting means for prompting the work position adjusting mechanism of the matching section to perform the work position adjusting operation via the arithmetic adjusting means in accordance with the contents of the verification from the first detecting means. A substrate for an electronic circuit, characterized in that a transport means set in the alignment unit and transporting the work whose position has been aligned as it is to the printing unit is reciprocally movable between the alignment unit and the printing unit. Screen printing device for 4. A transporting means disposed between the aligning unit and the printing unit so as to reciprocate through the center of the aligning unit and the printing unit, and a first detecting unit and a second detecting unit. 4. A script for an electronic circuit board according to claim 3, wherein a CCD camera is used as the means, and these detecting means are provided so as to be able to move forward and backward with respect to the center of the matching section and the printing section, respectively. -Printing device.