Method of manufacturing a substrate structure for increasing cutting precision and strength thereof

This Application is a Continuation-in-Part of application Ser. No. 10/918,371, filed on 16 Aug. 2004 now abandoned, and entitled METHOD OF MANUFACTURING A SUBSTRATE STRUCTURE FOR INCREASING CUTTING PRECISION AND STRENGTH THEREOF.

1. Field of the Invention

The present invention relates to a method of manufacturing a substrate structure provided for mounting a light emitting diode (LED) thereon, and more particularly, relates to a manufacturing method for increasing cutting precision and strength of the substrate structure.

2. Description of the Related Art

In the electronic industry, the electronic packaging industry will gradually get important due to electronic products which are required in light, thin, short, small and high function besides the semiconductor industry. The packaging technique in the electronic packaging industry will find new ways of doing things from old theories, such as a ball gate array package, a plastic pin-grid array package, TQFP, TSOP, etc.

In a conventional electronic packaging technique, a semiconductor integrated circuit is manufactured and then assembled with other electronic elements to become an electronic product for achieving a specific design function. The electronic packaging technique provides four main functions, which respectively are power distribution, signal distribution, heat dissipation, and protection and support, applying to IC chap packaging and LED packaging.

The electronic packaging technique can be divided into different levels, as follows. A first level packaging (or chip level packaging) is provided for combining the IC chip with the packaging structure to form an electronic module. In plastic dual-in-line package (PDIP), the first level packaging includes die attach, wire bond and encapsulation. A second level packaging is provided for assembling the electronic module on the circuit board to form a circuit card or a printed circuit board. In the second level packaging, it is noticed to manufacture of the circuit board and connection technique between the electronic elements and the circuit board, such as a pin through hole (PTH) and a surface mount technology (SMT). A third and fourth level packages are provided for combination of the circuit board and the circuit card to form sub-system and system.

Referring to FIG. 1 , a conventional metal substrate 1 a will be cut by a cutter 12 a . When cutting, the conventional metal substrate 1 a will have some cutting questions due to the structure strength and the cutting precision, thereby to easily produce cutting bur and structure deformation. Further, it will affect the cutting speed and precision, thereby to increase defective fraction of the packaging product.

The present invention has been conceived to solve the problem in the background art, and the object of the present invention is to provide a method for combining the substrate with the polymer composite material, thereby to raise cutting precision and strength of the semiconductor substrate structure.

It is therefore a principal object of the present invention to provide a semiconductor substrate structure, which can obtain better structure strength so as to easily be cut and keep better cutting precision.

Another object of the present invention is to provide a method of manufacturing a substrate structure provided for mounting a light emitting diode (LED) thereon, which can obtain lower cost and high quality of packaging processing.

To achieve the above object, one feature of the present invention is provided for a method of manufacturing a substrate structure

including: (1) providing a metal substrate having a metal portion; (2) chemically etching a plurality of trenches in the metal substrate; (3) applying a polymer composite material into the trenches to form a substrate having a polymer composite portion abutted to the metal portion; (4) polishing a surface of the substrate to make a height of the polymer composite portion equal to that of the metal portion; (5) forming a covering material on the surface of the substrate; and (6) cutting the substrate via the polymer composite portion for decreasing cutting bur produced on the metal portion.

To provide a further understanding of the invention, the following detailed description illustrates embodiments and examples of the invention, this detailed description being provided only for illustration of the invention.

The drawings included herein provide a further understanding of the invention. A brief introduction of the drawings is as follows:

FIG. 1 is a schematic view of a conventional substrate structure in a cutting condition;

FIGS. 2A-2F are cross-sectional views illustrating a sequence of steps for a method of manufacturing a substrate structure in accordance with the present invention;

FIG. 3 is a perspective view of a metal substrate having a plurality of trenches after the step of chemically etching;

FIG. 3A is an enlarged view of “A” part of FIG. 3 .

FIG. 4 is a perspective view of a substrate having a polymer composite portion after the step of filling a polymer composite material; and

FIG. 4A is an enlarged view of “A” part of FIG. 5 .

Referring now to the drawings wherein the showings are for purposes of illustrating preferred embodiments of the present invention only, and not for purposes of limiting the same, FIGS. 2A-2F are cross-sectional views illustrating a sequence of steps for a method of manufacturing a substrate structure in accordance with the present invention.

Please refer to FIGS. 2A-2F , a method of manufacturing a substrate structure provided for mounting a light emitting diode (LED) thereon includes the steps of: (1) providing a metal substrate 1 having a metal portion 10 ; (2) roughing a surface of the metal substrate by means of a chemical process or a sand-blasting process; (3) chemically etching a plurality of trenches 14 in the metal substrate 1 ; (4) applying a polymer composite material (such as a polyethylene material, PE) by means of a screen printing process or a steel plate printing process or an insert molding process into the trenches 14 to form a substrate 1 ′ having a polymer composite portion 12 abutted to the metal portion 10 ; (5) polishing or sand-blasting a surface of the substrate 1 ′ to make a height of the polymer composite portion 12 equal to that of the metal portion 10 ; (6) forming a covering material (such as a conductive layer 13 ) by means of an electroplating process on the surface of the substrate; and (7) cutting the substrate via the polymer composite portion 12 for decreasing cutting bur produced on the metal portion.

FIG. 3 or FIG. 3A shows a perspective view of the metal substrate 1 with the metal portion 10 and the trenches 14 after the step of chemically etching the trenches 14 . FIG. 4 or FIG. 4A shows a perspective view of the substrate 1 ′ with the metal portion 10 and the polymer composite portion 12 after the step of filling the polymer composite material.

The present invention has a main feature in that: the metal substrate and the polymer material are combined together, thereby to improve the material property of the substrate structure, to provide lower equipment cost and not affect chip packaging process.

The mechanical equipments for applying the polymer composite material supplied into the trench of the substrate or polishing the surface of the substrate will not need the high cost, thereby easy to obtain or install. The substrate structure of the present invention is a strong structure and to be cut easily. Further, the process method of the present invention will not affect the original packaging process, and it can be operated into the original packaging process due to the unchanged packaging machine to achieve the present requirement.

The present invention has following advantages: (1) the arrangement of new manufacturing process is easy, so that the requirement of price and technique of new equipment is not high; (2) the mechanical strength of the substrate structure is better; (3) the cutting of the substrate structure is easy; and (4) the original packaging machine still can be used in the original packaging process.

While the preferred embodiment in accordance with the present invention has been shown and described, and the alternative embodiment has been described, equivalent modifications and changes known to persons skilled in the art according to the spirit of the present invention are considered to be within the scope of the present invention as defined in the appended claims.