Source: http://www.google.com/patents/US6392294?dq=6480844
Timestamp: 2015-01-25 19:47:59
Document Index: 543657581

Matched Legal Cases: ['art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2']

Patent US6392294 - Semiconductor device with stable protection coating - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA semiconductor device is provided which includes an insulating substrate, a conductive terminal supported by the substrate, a semiconductor chip mounted on the substrate, and a protection coating for enclosing the chip. The protection coating is integrally formed with an anchoring portion. The substrate...http://www.google.com/patents/US6392294?utm_source=gb-gplus-sharePatent US6392294 - Semiconductor device with stable protection coatingAdvanced Patent SearchPublication numberUS6392294 B1Publication typeGrantApplication numberUS 09/464,488Publication dateMay 21, 2002Filing dateDec 15, 1999Priority dateDec 22, 1998Fee statusPaidPublication number09464488, 464488, US 6392294 B1, US 6392294B1, US-B1-6392294, US6392294 B1, US6392294B1InventorsTomoji YamaguchiOriginal AssigneeRohm Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (5), Referenced by (32), Classifications (44), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetSemiconductor device with stable protection coatingUS 6392294 B1Abstract A semiconductor device is provided which includes an insulating substrate, a conductive terminal supported by the substrate, a semiconductor chip mounted on the substrate, and a protection coating for enclosing the chip. The protection coating is integrally formed with an anchoring portion. The substrate is formed with an engaging portion for engagement with the anchoring portion of the coating.
an insulating substrate having obverse and reverse surfaces; a conductive terminal supported by the substrate and formed with a bore; a semiconductor chip mounted on the obverse surface of the substrate and electrically connected to the terminal; and a protection coating arranged on the substrate for enclosing the chip, the protection coating being integrally formed with an anchoring portion; a protection coating arranged on the substrate for enclosing the chip, the protection coating being integrally formed with an anchoring portion; wherein the substrate is formed with a through-hole in which the anchoring portion of the coating is received, the through-hole communicating with the bore of the terminal; and wherein the bore of the terminal is smaller in diameter than the through-hole of the substrate for causing the conductive terminal to overhang above the through-hole. 2. The semiconductor device according to claim 1, wherein the through-hole is constant in diameter.
For meeting the recent downsize requirements, the conventional diode Y has relatively small dimensions (1.6�0.8 mm or 1.0�O.5 mm in a plan view). Disadvantageously, in such a small diode, it is difficult to provide the base unit 1 with a sufficiently large surface area disposed to the exterior. Thus, in use, the resin coating 5 may rather readily be detached from the base unit 1, thereby causing damage to the LED chip 3 and the wire 4.
SUMMARY OF THE INVENTION The present invention has been proposed under the above circumstances, and its object is to improve the bonding strength between a substrate and a protection coating in a small electronic device.
FIG. 4-4A show sectional view taken along lines IV�IV in FIG. 3;
The light-emitting diode X1 includes a base unit 1, an LED chip 3 and a resin coating 5. The base unit 1 is constituted by a rectangular insulating substrate 1 a, a negative terminal or cathode 2A as an output terminal, and a positive terminal or anode 2B as an input terminal. The insulating substrate 1 a may be made of a heat-resistant polyimide resin such as �BT resin (Trade Name)� or a suitable glass fabric. As shown in FIG. 2, the substrate 1 a is formed with two through-holes 13 arranged at symmetrical positions in the substrate 1 a. The through-holes 13 may be made by a conventional method using a laser beam, a drill, water jet or the like.
The cathode 2A and the anode 2B are formed on the substrate 1 a, both extending from the upper surface 10 of the substrate 1 a onto the lower surface 12 via a side surface 11. As a result, each of the cathode 2A and the anode 2B contains a folded-back portion enclosing an end portion of the substrate 1 a. The cathode 2A includes an upper part 2 a disposed on the upper surface 10 of the substrate 1 a. The upper part 2 a is provided with a die-boding area 21 a extending toward the anode 2B. The LED chip 3 is attached to the die-boding area 21 a via silver paste for example. Similarly, the anode 2B includes an upper part 2 b disposed on the supper surface 10 of the substrate 1 a, and the upper part 2 b is provided with a wire-bonding area 21 b extending toward the cathode 2A. The wire-bonding area 21 b is electrically connected to the upper surface 30 of the LED chip 3 by a wire 4 which is made of gold for example.
As shown in FIG. 1, the cathode 2A is formed with a bore 20 a located adjacent to (or overlapping into) the die-boding area 21 a, while the anode 2B is formed with a bore 20 b located adjacent to (or overlapping into) the wire-bonding area 21 b. As shown in FIG. 2, the two bores 20 a, 20 b correspond in position to the through-holes 13 of the substrate 1 a, so that each of the bores 20 a, 20 b communicates with one of the through-holes 13. The diameter of the bores 20 a, 20 b is made smaller than that of the through-holes 13. Thus, the through-holes 13 are partially covered by the upper part 2 a of the cathode 2A or the upper part 2 b of the anode 2 b. The cathode 2A and the anode 2B may be produced by etching a layer of conductive metal (copper or nickel for example) provided on the substrate 1 a. In this etching process, the two bores 20 a, 20 b may also be formed. Thereafter, the cathode 2A and the anode 2B may be subjected to nickel-plating or gold-plating by an electroplating technique. In this manner, the cathode 2A and the anode 2B advantageously become resistant to oxidation. Another advantage of performing the plating is that the wire 4 can be firmly attached to the cathode 2B.
As shown in FIGS. 3 and 4-4A, the metal conductors 2 are formed at a corresponding one of the slits 14. In section (FIG. 4-4A), each conductor 2 extends from the upper surface of the plate 1 b onto the lower surface thereof via the inner surface of the slit 14. As shown in FIG. 4-4A, the metal conductor 2 is made up of three layers, that is, a lower copper layer 25, an intermediate nickel layer 26 and an upper gold-plated layer 27. The metal conductor 2 includes a plurality of die-bonding portions 21 a and a plurality of wire-bonding portions 21 b. The metal conductor 2 is also formed with a plurality of bores 20 a, 20 b. The matrix board 1A described above may be obtained in the following manner. First, the parallel slits 14 are formed in the insulating plate 1 b by using a suitable cutting tool. Then, a layer of copper is formed on the plate 1 b by sputtering or evaporation. This layer is subjected to etching processes to remove unnecessary portions (at this stage, the bores 20 a, 20 b are formed). Then, the surface of the remaining copper layer is subjected to nickel-plating and further to gold-plating. The thicknesses of the copper layer 25, the nickel layer 26 and the gold layer 27 may be 18-33 μm, about 5 μm and about 0.3 μm, respectively.
FIG. 10 shows a modified version of the light-emitting diode X3. The illustrated light-emitting diode X4 has a resin coating 5B including a relatively bulky auxiliary fixing portion 51 c. As shown, the auxiliary fixing portion 51 c protrudes downward to a predetermined extent. With such an arrangement again, a body 51 a of the resin coating 5B is firmly attached to an insulating substrate 1 a. Reference is now made to FIG. 11 illustrating a light-emitting diode according to a third embodiment of the present invention.
The basic arrangements of the illustrated light-emitting diode X5 are similar to those of the light-emitting diode X1 of the first embodiment, except for the configuration of through-holes 13 a of an insulating substrate 1 a. Specifically, the through-hole 13 a of the third embodiment becomes larger in diameter, as proceeding from the upper opening to the lower opening. In other words, the through-hole 13 a has a downwardly flaring configuration or upwardly tapering configuration. Accordingly, anchoring portions 50 a of a resin coating 5 are made into the same flaring shape as the through-holes 13 a. With such an arrangement, the anchoring portions 50 a cannot (or at least not easily) be pulled out of the through-holes 13 a, whereby the resin coating 5 is firmly attached to the substrate 1 a. In the light-emitting diode X5, bores 20 a, 20 b formed in a cathode 2A or an anode 2B are equal in diameter to the upper openings of the through-holes 13 a. Alternatively, the bores 20 a, 20 b may be diametrically smaller than the upper openings of the through-holes 13 a. FIG. 12 shows a modified version of the light-emitting diode X5 shown in FIG. 11. The modified light-emitting diode X6 is basically similar to the diode X5 of FIG. 11, except that the posture of through-holes 13 b is turned upside down. Specifically, the through-hole 13 b of FIG. 12 becomes greater in diameter, as proceeding from the lower opening to the upper opening.
With such an arrangement, a molten resin material, which is supplied onto the upper surface of a base unit 1 for forming the resin coating 5, will easily be introduced into the through-holes 13 b. The resin material filled in the through-holes 13 b is solidified to provide downwardly tapering anchoring portions 50 b. Though not shown in FIG. 12, an auxiliary fixing portion (see FIG. 9) connected to the anchoring portions 50 b may be provided to extend on part of the bottom surface of the substrate 1 a. It is possible in this way to prevent the resin coating 5 from being detached from the substrate 1 a. FIG. 13 shows a light-emitting diode according to a fourth embodiment of the present invention. The illustrated light-emitting diode X7 is similar to the light-emitting diode X1 (see FIG. 2), except that a base unit 1 does not laterally protrude from a resin coating 5. Thus, as viewed from above (or below), the resin coating 5 and the base unit 1 have the same size. With such an arrangement again, the resin coating 5 is stably attached to a substrate 1 a by causing anchoring portions 50 to be fitted into through-holes 13 of the substrate 1 a. FIGS. 14 and 15 show a modified version of the light-emitting diode X7 of FIG. 13. The illustrated light-emitting diode X8 is provided with two retreated portions 14 for facilitating the soldering of the diode X8 to e.g. a printed circuit board (not shown). The retreated portions 14 are arranged at the longitudinal ends of the base unit 1, one retreated portion 14 for a cathode 2A and the other retreated portion 14 for an anode 2B. Such retreated portions for performing soldering may be formed in the light-emitting diodes X1-X6.
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