JPH04220181A - Printed board marked by laser beam and its machining method - Google Patents

Abstract

PURPOSE:To maintain the function of a board by using the side of the board as the surface of a printed board to be machined by laser beam. CONSTITUTION:When letters, etc., are marked by a laser beam machine on the printed board, a recess 6c is prepared on the side 6b of the printed board 6 and marks such as the letters and a bar code are stamped by the laser beam machine in the recess 6c. Consequently, letters, etc., can be marked on the printed board without impairing functions such as holding of many circuit elements, wiring and, at the same time, irrespective of material on which letters, etc., are marked, contrast between printed letters and the color of material itself becomes sharp and the precision of automatic reading is improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board marked with characters and the like using a laser beam machine, and a method for processing the printed circuit board.

0002

2. Description of the Related Art FIG. 6 is a conceptual diagram for explaining a marking processing method using a conventional beam scanning type laser processing machine. In the figure, 1 is a laser oscillator, 2 is a laser oscillation power supply, 3 is a beam scanning device, 4 is a drive device for the beam scanning device 3, 5 is a control device that controls the entire processing device, and 6 is a printed circuit board that is a workpiece. It is.

Conventionally, the following method has been used to inscribe marks such as management numbers on printed circuit boards using such a laser processing machine.

That is, a laser beam emitted from a laser oscillator 1 is focused onto a flat surface 6a of a printed circuit board 6 by a beam scanning device 3 to perform processing. At this time,
By operating the beam scanning device 3, the laser beam can be focused at any position on the plane 6a of the printed circuit board 6. Thereby, a mark such as a desired character can be engraved on the flat surface 6a of the printed circuit board 6.

By the way, the meaning of stamping a mark such as a control number on the printed circuit board 6 is that during the assembly process of mounting circuit elements on the printed circuit board 6, the control number is stamped on each printed circuit board 6. , it is possible to support high-mix, low-volume production by changing the mounted elements depending on the number.

[0006] Also, the reason why a mark is engraved with a laser beam is that, for example, if a mark is engraved with paint, etc., a drying process is required, which causes the problem of lowering production efficiency. This is because there is an advantage that post-processing such as this drying step can be made unnecessary by doing so.

[0007]

[Problems to be Solved by the Invention] However, in the conventional laser marking processing method, as described above, processing is performed on the flat surface 6a of the printed circuit board 6. Printed circuit board 6
It was necessary to secure a machining area for marking on the component mounting surface of the machine, which was an obstacle when raising the machine. In other words, in addition to the area required for the circuit elements and their wiring, there is a processing area for marking that is a dead space.

Furthermore, even if the printed circuit board 6 has a sufficient flat surface for processing, the material for the printed circuit board 6 is limited due to electrical constraints, safety constraints, and price constraints. Depending on the material, even if characters are printed by a laser processing machine, the contrast between the color of the printed characters and the color of the printed circuit board 6 itself is unclear, and the There was a problem in that it was impossible to read using a reader or the reading accuracy was poor.

In view of the above points, the present invention aims to provide a printed circuit board on which characters are laser-marked and a method for processing the same, without reducing the mounting density or the accuracy of automatic reading of laser-marked characters. It is something to do.

0010

[Means for Solving the Problems] The laser-marked printed circuit board according to the present invention is one in which characters and the like are engraved on the side surface of the printed circuit board using a laser processing machine.

Further, the laser-marked printed circuit board according to the present invention is one in which characters or the like are engraved into through-holes of the printed circuit board using a laser processing machine.

Further, the laser-marked printed circuit board according to the present invention is one in which characters or the like are engraved on the surface of a mounted component using a laser processing machine.

[0013] Also, the surface on which characters and the like are marked is coated with a paint that changes color when exposed to laser light.

Furthermore, the laser marking processing method according to the present invention is such that a laser processing machine is used to mark characters or the like on the side surface of a printed circuit board.

Furthermore, the laser marking processing method according to the present invention is such that a laser processing machine is used to mark characters or the like in through holes of a printed circuit board.

Furthermore, the laser marking processing method according to the present invention is such that a laser processing machine is used to mark characters or the like on the surface of a component mounted on a printed circuit board.

[0017] Furthermore, in the laser marking processing method according to the present invention, after coating the processed surface of the printed circuit board with a paint that changes color by laser light, a laser processing machine is used to mark characters, etc. on this coated surface. It is something.

In addition, the laser marking processing method according to the present invention includes coating a part or the entire surface of a printed circuit board, including the processing surface, with a paint that changes color by laser light so that letters, etc. are formed, and then coating the coated surface. It is designed to mark characters, etc. using a laser processing machine.

[0019]

[Operation] In the present invention, by making the surface processed by the laser beam the side surface of the printed circuit board, the through hole, or the surface of the mounted component, the main function of the printed circuit board, which is to hold and wire a large number of circuit elements, is impaired. It becomes possible to mark characters, etc. on the printed circuit board without any trouble, and it can be given an identification function.

[0020] Furthermore, by applying a paint that changes color with the laser beam in advance to the surface processed by the laser beam, the contrast between the color of the printed characters and the color of the material itself can be improved, regardless of the material on which the characters are marked. This improves automatic reading accuracy.

[0021] Furthermore, after coating a surface processed by a laser beam with a paint that changes color due to the laser beam so as to form characters, etc., a laser processing machine is used to mark characters, etc. on the coated surface. Since the printed circuit board can be identified by both the characters formed by the laser beam and the characters marked by the laser beam, automatic reading accuracy is further improved.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below using illustrated embodiments.

FIG. 1 is a conceptual diagram for explaining a printed circuit board and a marking processing method using a beam scanning laser processing machine according to a first embodiment of the present invention. The printed circuit board 6 of this embodiment has a recess 6c formed on its side surface 6b, and a mark such as a character or a bar code is engraved in the recess 6c by a laser processing machine.

[0024] This will be explained according to the processing procedure.
First, a recess 6 is formed in a predetermined portion of the side surface 6b of the printed circuit board 6.
c is formed, and the side surface 6b of the printed circuit board 6 is arranged to face the beam scanning device 3. Thereafter, a laser beam emitted from the laser oscillator 1 is focused onto the recess 6c of the side surface 6b of the printed circuit board 6 by the beam scanning device 3 to perform processing. At this time, by operating the beam scanning device 3, the laser beam is focused on an arbitrary position on the recess 6c of the side surface 6b of the printed circuit board 6, and a mark such as a desired character or barcode is placed on the side surface of the printed circuit board 6. 6
Mark on b.

The printed circuit board 6 that has been laser marked by such a processing method can be marked with characters, bar codes, etc. without impairing the main functions of the printed circuit board 6, which are holding and wiring a large number of circuit elements. Therefore, it is easy to increase the packaging density while providing an identification function.

In particular, in the above embodiment, since the concave portion 6c provided on the side surface 6b of the printed circuit board 6 is used as the processing surface, damage to the marking surface due to contact with the conveyance equipment during transportation of the printed circuit board 6 can be eliminated. .

FIG. 2 is a conceptual diagram for explaining a marking processing method using a printed circuit board and a beam scanning laser processing machine according to a second embodiment of the present invention. The printed circuit board 6 of this embodiment has an upper side 6b of 30 to 30
A large chamfer is formed at an angle of 60 degrees to form an inclined surface 6c,
Marks such as characters and barcodes are engraved on the inclined surface 6c using a laser processing machine.

[0028] This will be explained according to the processing procedure.
First, the upper side of the side surface 6b of the printed circuit board 6 is largely chamfered in advance to form an inclined surface 6c, and the side surface 6b of the printed circuit board 6 is placed facing the beam scanning device 3. after that,
A laser beam emitted from a laser oscillator 1 is focused by a beam scanning device 3 onto an inclined surface 6c of a side surface 6b of a printed circuit board 6 to inscribe marks such as characters and barcodes.

In this embodiment, since the inclined surface 6c provided on the side surface 6b of the printed circuit board 6 is used as the processing surface,
In addition to making it possible to enlarge the printing surface compared to the space occupied by the processing surface when viewed from above, there are no restrictions on the mounting direction of the beam scanning device 3 and the reading device, allowing for free arrangement of mechanical equipment and optimization of equipment. This enables flexible design and installation.

FIG. 3 is a conceptual diagram for explaining a marking processing method using a printed circuit board and a beam scanning laser processing machine according to a third embodiment of the present invention. In the printed circuit board 6 of this embodiment, a mark such as a character or a bar code is engraved by a laser processing machine on the inner peripheral surface of a through hole 6e for mounting an electronic component 7.

Further, in this embodiment, the laser head 8 that guides the laser beam of the laser processing machine to the through hole 6e is provided so that its tip can be inserted into the through hole 6e, and a notch is provided on one side of the tip. 8a is formed, and a very small mirror 9 for guiding the laser beam toward the inner peripheral surface of the through hole 6e through the notch 8a is built inside the tip thereof, and the laser head 8 is used during marking.
It is configured such that a mark such as a character or a bar code is engraved while rotating within the through hole 6e. In addition,
The reading device is also provided with an optical system (not shown) similar to the laser head 8.

[0032] This will be explained according to the processing procedure.
First, the tip of the laser head 8 is fitted into the through hole 6e of the printed circuit board 6, which has been drilled in advance. after that,
While rotating the laser head 8, a laser beam emitted from a laser oscillator is focused onto the inner peripheral surface of the through hole 6e of the printed circuit board 6 by a beam scanning device to inscribe marks such as characters and bar codes.

In this embodiment, since the through-hole 6e of the printed circuit board 6 is used as the processed surface, it is possible to engrave characters, bar codes, etc. on areas that are generally inconspicuous. This embodiment is particularly effective for products with few cords and the like.

Further, in the embodiment shown in FIG. 3, a taper 6f is provided at the upper edge of another through hole 6e, and the taper 6f surface is used as the processed surface. In addition, the same effects as in the second embodiment can be expected.

FIG. 4 is a conceptual diagram for explaining a marking processing method using a printed circuit board and a beam scanning laser processing machine according to a fourth embodiment of the present invention. In the printed circuit board 6 of this embodiment, a mark 10 such as a character is engraved on the surface of the mounted electronic component 7 by a laser processing machine.

[0036] This will be explained according to the processing procedure.
First, insert the electronic component 7 into the through hole 6e of the printed circuit board 6.
Insert the terminal and install it. Thereafter, a laser beam emitted from a laser oscillator is focused onto the surface of the electronic component 7 by a beam scanning device to inscribe a mark 10 such as a character.

In this embodiment, since the surface of the electronic component 7 is used as a processed surface, there is an advantage that there is no need to secure mark positions on the printed circuit board 6 itself.

FIG. 5 is a conceptual diagram for explaining a marking processing method using a printed circuit board and a beam scanning laser processing machine according to a fifth embodiment of the present invention. This embodiment is basically the same as that of the fourth embodiment shown in FIG.
This embodiment differs from the fourth embodiment in that it uses a dummy component 11 which is essentially an unnecessary component in terms of the circuit.

In this embodiment, by additionally attaching the dummy component 11, even in the position shown in the figure where the electronic component 7 is located, where it is impossible to engrave characters, etc. with a laser beam, necessary characters, etc., can be marked. 10 can be engraved.

[0040] Furthermore, in each of the first to fifth embodiments,
A paint 12 such as thermosetting paint that changes color with laser light is applied in advance to each surface on which characters are to be marked, and characters and the like can be marked on this coated surface using a laser processing machine. This makes it possible to sharpen the contrast between the color of the printed characters and the color of the material itself, regardless of the material on which the characters are marked, making it even clearer than when directly marking the printed circuit board 6 or mounted components. It becomes possible to apply markings, improving automatic reading accuracy.

Furthermore, when applying the paint 12, by applying the paint 12 so that characters, etc. are formed on a part or the entire surface including the processed surface, the characters, etc. formed with the paint 12 can be applied to the printed circuit board. Furthermore, by applying the paint 12 to form characters, etc., and then marking the characters, etc. on the coated surface with a laser beam, the characters formed by the paint and the marking can be marked by the laser beam. Since the printed circuit board can be identified using both characters, automatic reading accuracy is further improved.

The paint 12 to be applied is normally required in the manufacturing process of the printed circuit board 6, but by using silk printing or ink mixed with paint etc. in solder resist, the material and process can be easily applied. Since the present invention can be implemented without significantly changing the manufacturing process, the present invention can be implemented at low cost.

Furthermore, since the paint 12 to be applied can be printed over the entire surface of the printed circuit board 6, there is an advantage that there is no need to specify the marking position.

[0044] In each of the above-described embodiments, markings such as characters are performed by scanning a laser beam with the beam scanning device 3, but the marking method is not limited to this. Alternatively, the laser beam may be irradiated through a mask formed with a pattern such as letters, for example.

[0045]

As described above, according to the present invention, since the surface processed by the laser beam is the side surface of the printed circuit board, the through hole, or the surface of the mounted component, a large number of circuits, which are the main function of the printed circuit board, can be processed by the laser beam. It is possible to mark characters, etc. on a printed circuit board without impairing the functions of holding elements and wiring, and this has the effect that it can have an identification function.

[0046] Furthermore, by applying a paint that changes color with the laser beam in advance to the surface processed by the laser beam, the difference between the color of the printed characters and the color of the material itself can be improved, regardless of the material on which the characters are marked. This has the effect of making the contrast clearer, making it possible to make more clear markings than when directly marking printed circuit boards or mounted components, and improving automatic reading accuracy.

[0047] Furthermore, after coating a part or the entire surface of the printed circuit board, including the processed surface, with a paint that changes color when exposed to a laser beam so as to form letters, etc., the coated surface is marked with letters, etc. using a laser beam. This makes it possible to identify the printed circuit board using both the characters formed with paint and the characters marked with a laser beam, which has the effect of further improving automatic reading accuracy.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of a second embodiment of the present invention.

FIG. 3 is a conceptual diagram of a third embodiment of the present invention.

FIG. 4 is a conceptual diagram of a fourth embodiment of the present invention.

FIG. 5 is a conceptual diagram of a fifth embodiment of the present invention.

FIG. 6 is a conceptual diagram for explaining a conventional laser marking processing method.

[Explanation of symbols]

1 Laser oscillator 2 Laser oscillation power supply 3 Beam scanning device 4 Drive device 5 Control device 6 Printed circuit board 6b Side 6e Through hole 7 Electronic parts (mounted parts) 10 mark 11 Dummy parts (installed parts) 12 Paint

Claims (9)

[Claims] 1. A printed circuit board on which characters and the like are laser-marked using a laser processing machine, wherein the characters and the like are engraved on a side surface of the printed circuit board. 2. A laser-marked printed circuit board on which characters, etc. are laser-marked using a laser processing machine, wherein the characters, etc. are engraved in through-holes of the printed circuit board. 3. A laser-marked printed circuit board on which characters and the like are laser-marked using a laser processing machine, wherein the characters and the like are engraved on the surface of a mounted component. 4. The laser-marked printed circuit board according to claim 1, wherein the surface on which characters or the like are to be marked is coated with a paint that changes color when exposed to laser light. 5. A laser marking method for marking characters or the like on a printed circuit board using a laser processing machine, the method comprising using a side surface of the printed circuit board as a processing surface. 6. A laser marking method for marking characters or the like on a printed circuit board using a laser processing machine, the method comprising using a through hole of the printed circuit board as a processing surface. 7. A laser marking method for marking characters or the like on a printed circuit board using a laser processing machine, the method comprising using a surface of a mounted component as a processing surface. 8. In a laser marking processing method for marking characters, etc. on a printed circuit board using a laser processing machine, a paint that changes color by laser light is applied to the processed surface of the printed circuit board, and then characters, etc. are marked on this coated surface. A laser marking processing method characterized by: 9. In a laser marking processing method of marking characters, etc. on a printed circuit board using a laser processing machine, the characters, etc. are formed on a part or the entire surface of the printed circuit board, including the processed surface, using paint that changes color by laser light. A laser marking processing method characterized by marking characters, etc. on the coated surface using a laser beam.