JPS6143594A - Marked article and production thereof - Google Patents

Abstract

PURPOSE:To obtain a marked article with favorable discriminability of a mark, by a method wherein a colored layer having a hue different from that of an article and giving a high contrast to the surface of the article is embedded in a groove formed by laser marking. CONSTITUTION:The surface of a black-colored resin package is subjected to laser marking to produce a groove, which is filled with a white-colored ink by printing. Namely, a semiconductor device 4 subjected to laser marking at a laser marking station is fed to a printing station, where the groove 11 formed by laser marking is filled with a white-colored ink by printing. The printing is conducted as follows. A tampon 12 is reciprocated between an engraved plate 13 having the same pattern as that of the mark 3 and the semiconductor device 4, the ink 15 placed in the incised pattern 14 of the engraved plate 13 is adhered to the surface of the tampon 12, and is then transferred from the tampon 12 to the surface of the resin package 1 of the semiconductor device 4, precisely, into the groove 11 formed by laser marking.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to marking articles, particularly laser marking articles and methods of manufacturing the same.

[Background technology]

Conventionally, transfer stamping technology using ink has been known as a marking technology for articles such as electronic parts, but since this technology requires a lot of incidental work and has low productivity, recently laser marking using laser light irradiation has been used. For example, if the system is
Document entitled "High-speed laser marking system" on page 42, (2), Automation Technology, Vol. 16. No.

3 (1984) by Nakano et al.
Document entitled (3) 9 Machines and Tools.

Vol. No. 4 (1984), in a document entitled "Laser Marking System" by Shoka et al.

These laser marking technologies can be applied to metals and resins.
This method has been applied to many materials such as ceramics, but in both cases, the printing mechanism is to partially melt the surface of the material by irradiating it with laser light and evaporate it to form the desired groove pattern. ing.

By the way, although a laser mark functions as a mark by changing the quality of the groove bottom of the groove pattern and making it rough due to the energy of the laser beam, it is essentially a groove bottom. is the same material as the surface of the article. For this reason, as stated in the above literature,
Marks may be difficult to read depending on the workpiece (article).

Such laser marking is beginning to be frequently used for products (articles) such as electronic parts.

However, for electronic parts such as semiconductor devices whose puff cage parts are manufactured using black resin mixed with carbon black etc. to improve flame retardancy, brown groove patterns are printed on the black surface. It is difficult to say that the laser mark 9 can be read well.

[Purpose of the invention]

An object of the present invention is to provide a marking article with good mark identifiability.

Another object of the present invention is to provide a method for manufacturing laser-marked articles that is suitable for mass production, has low marking costs, and has good identifiability.

The above and other objects and novel features of the present invention include:
It will become clear from the description of this specification and the accompanying drawings.

[Summary of the invention]

A brief overview of typical inventions disclosed in this application is as follows.

That is, the present invention applies laser marking to the surface of a black resin package and prints and fills the grooves formed by the laser marking with white ink. The mark becomes clear, and the distinguishability of the mark can be improved.

〔Example〕

FIG. 61 is a schematic diagram showing an overview of a marking method according to an embodiment of the present invention, FIG. 2 is a sectional view similarly showing an ink filling state, and FIG. , FIG. 4 is a partial sectional view showing a state in which the laser marking portion is filled with ink.

This embodiment shows an example in which marking is applied to a resin package type semiconductor device. As shown in FIG. 3, a resin package type semiconductor device includes a resin package 1 made of resin and a plurality of boards 2 protruding from both sides of the resin package 1, respectively. Since the resin constituting the resin package 1 contains carbon blank to improve flame retardancy, its hue is black. Further, the leads 2 are bent in the same direction near the root of the resin package 1, forming a so-called dual in-line type. On the surface of the resin package 1, the upper surface in the figure, there is a mark 3, for example, "HDOOl".
is displayed.

Mark 3 is white and resin package 1 is black.
From there, it seemed like it was floating clearly,
The distinguishability of mark 3 is good.

Next, regarding the manufacturing method of such a semiconductor device 4,
This will be explained with reference to FIGS. 1 and 2.

As shown in FIG. 1, the semiconductor device 4 is mounted on an elongated rail 5 and moves intermittently. The semiconductor device 4 is configured such that the bottom of the resin puff cage 1 is placed on the rail 5,
It is pushed by the pusher 6 and moves in such a state that the leads 2 extending on both sides protrude below both sides of the rail 5. For example, on this rail 5, a 25mm stick magazine (not shown) housed in a regular stick magazine is stored.
The semiconductor devices 4 are supplied by the intermittent ejecting operation of the semiconductor device 4 at the rearmost end of the busher 6, and are sequentially carried into an empty stick magazine (not shown) disposed on the opposite side. .

Furthermore, a laser marking station and an ink printing station are provided along the flow direction of the semiconductor devices 4 at the position where the rail 5 is provided. At the former laser marking station, marks 3 are printed on the front surface (principal surface) of the resin package 1 of the semiconductor device 4 by laser beam irradiation. In other words, the laser marking system is a mask-based laser marking system that irradiates the printing surface with laser light that has passed through a mask.
Alternatively, a scanning laser marking system that prints by scanning a laser beam onto the marking surface is generally used. For example, in this embodiment, the former mask-based laser marking system is used to mark the surface of the resin package 1 of the semiconductor device 4. The case of applying a mark will be explained.

The mask type laser marking system uses a laser generator 7 and a laser beam 8 emitted from the laser generator 7 to be applied to the surface of a resin package 1 of a semiconductor device 4 to be processed using a half mirror 9 and a condensing lens 10. It consists of an optical system that guides the Then, at the laser marking station, a mark 3 is printed on the surface of the resin package 1 of the semiconductor device 4 by this mask type one-norther marking system. The mark 3 is formed by a groove pattern formed by melting and evaporating resin.

The semiconductor device 4 that has been laser marked at the laser marking station is then coated with white ink in the groove 11 formed by the laser marking at the next printing station.
(see Figure 4). At the printing station, printing is performed by offset, as shown in FIG. That is, Kumbo 12 is the mark 3.
The ink 15 placed in the depressions 14 of the concave plate 13 is adhered to the surface of the pad 12 by moving between the concave plate 13 having the same pattern and the semiconductor device 4 on the rail 5 as shown by the arrow. By transferring the ink 15 onto one surface of the resin package of the semiconductor device 4, the ink 15 is transferred.
is printed (filled) into the groove 11 formed by laser marking.

Since the ink 15 filled in the groove 11 is printed on the semiconductor device 4 by a printing station several pitches away from the laser marking station, it is easily dried by residual heat during laser marking, and a colored layer 16 is formed. Some types of ink are difficult to dry, so in such cases, natural drying or forced drying such as baking is required. However, when considering the number of work steps, a manufacturing method that does not particularly require a drying step is desirable.

The semiconductor devices 4 marked by the printing station are sequentially carried into a magazine (not shown), and the marking work is completed.

〔effect〕

(1) According to the marking method of the present invention, after laser marking is performed, the grooves formed by laser marking are filled with ink that has clear distinguishability (contrast) with respect to the hue of the surface of the object to be processed. Therefore, the printed mark can be identified very clearly and is sufficiently effective in terms of identifiability as a mark on a laser marked article.

(2) Since the white ink of the present invention is filled in the groove 11 having an inner circumferential wall roughened by laser beam irradiation, it is difficult to fall off, lasts a long time, and has the effect of extending the life of the mark. It will be done.

(3) According to the laser marking method of the present invention, the grooves formed by laser beam irradiation are filled with the desired ink, thereby increasing the distinctiveness of the mark. The effect is that effective marking can be performed even on objects.

(4) According to the above (1) to (3), according to the present invention, a synergistic effect can be obtained in that marking with high identifiability and long life can be made at low cost.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the above Examples and can be modified in various ways without departing from the gist thereof. For example, the hue of the ink may be any other hue as long as the mark is easily distinguishable. Furthermore, if a fluorescent paint is mixed into the printing ink, it is possible to obtain the effect that the marked article can be easily recognized even in a dark place. Furthermore, the same effects as in the above embodiments can be obtained by printing after laser marking by a commonly used squeegee printing method or a printing method using a roller whose circumferential surface is covered with rubber.

[Application field]

In the above description, the invention made by the present inventor was mainly applied to the marking technology for resin package type electronic components, which is the background field of application, but the invention is not limited to this, for example, It can be applied to marking technology for articles such as metals and ceramics.

The present invention can be applied to display technologies such as small markings and displays.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an overview of a marking method according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the same ink filling state, and FIG. 3 is a perspective view showing a semiconductor device similarly marked. , FIG. 4 is a partial cross-sectional view showing a state in which the laser marking portion is filled with ink. 1...Resin package, 2...Lead, 3...
Mark, 4... Semiconductor device, 5... Rail, 6...
・Pusher, 7... Laser generator, 8... Laser light, 9... Half mirror 110... Condensing lens, 1
1...Groove, 12...Tampo, 13...Concave plate, 14
... hollow, 15 ... ink, 16 ... colored layer.

Claims (1)

[Claims] 1. A marking article having a laser mark on its surface, wherein a colored layer having a different hue from the article and having a high contrast with the article surface is embedded in the groove forming the laser mark. A marking article characterized by: 2. The marking article according to claim 1, wherein the colored layer contains a fluorescent substance. 3. Claim 1 or 2, characterized in that it consists of a laser mark provided on the surface of a black resin package by laser beam irradiation, and a white colored layer embedded in this laser mark. Marking articles listed in section. 4. A method for manufacturing a marking article in which a laser mark is displayed on the surface of the article by partially irradiating the display surface of the article with a laser beam, the method comprising: adding a colored layer to the grooves formed by the laser beam after the laser beam irradiation; A method for manufacturing a marking article, characterized in that the marking article is filled with and formed. 5. The method for manufacturing a marking article according to claim 4, wherein the groove is filled with a colored layer containing a fluorescent substance.