Method of producing laser-processed product and adhesive sheet, for laser processing used therefor

Abstract

A manufacturing method of laser processed parts is characterized in that at least a pressure-sensitive adhesive layer is provided on a base material as a pressure-sensitive adhesive sheet (2) for laser processing, using a material having specified physical properties, and this method comprises a step of adhering the pressure-sensitive adhesive sheet (2) for laser processing to the laser beam exit side of the work (1) by way of the pressure-sensitive adhesive layer, a step of processing the work by irradiating the work with a laser beam (6) of within 2 times of the irradiation intensity for forming a through-hole in the work (1), at higher than the irradiation intensity of threshold for inducing ablation of the work (1), and a step of peeling the pressure-sensitive adhesive sheet (2) for laser processing from the work (1) after the machining. Therefore, contamination of the work surface by decomposition products can be effectively suppressed, and laser processed parts can be manufactured easily and at high production efficiency.

Description

TECHNICAL FIELD [0001] The present invention relates to a manufacturing method of laser processed parts for machining works such as various sheet materials, circuit boards, semiconductor wafers, glass substrates, ceramic substrates, metal substrates, semiconductor laser or other light emitting or receiving element substrates, MEMS substrates, semiconductor packages, cloth, leather, paper or the like, by using laser, by cutting, drilling, marking, grooving, scribing, trimming, or other shaping process, and an pressure-sensitive adhesive sheet for laser processing used for this purpose. BACKGROUND ART [0002] As the electronic and electric appliances are reduced in size recently, component parts are also reduced in size and advanced in definition, and high definition and high precision are demanded in machining of parts at machining precision of + / −50 μm or less. In the conventional press processing or blanking process, the precision is about + / −100 μm at most, and such demand cannot b...

AI Technical Summary

Benefits of technology

[0011] The invention is devised in the light of the above problems, and it is hence an object thereof to present a manufacturing method of laser processed parts easily and at production efficiency by effectively suppressing contamination of the machining surface due to decomposition products when machining the work by ablation of laser beam. It is other object to present a pressure-sensitive adhesive sheet for laser processing for use in the manufacturing method of laser processed parts.

Problems solved by technology

In the conventional press processing or blanking process, the precision is about + / −100 μm at most, and such demand cannot be satisfied.

Drilling of materials is also demanded to conform to high definition and high precision, and drilling by using conventional drill or die cannot meet the needs.

By using laser beam, however, carbon deposits and other decomposition matter generated from the work, pressure-sensitive adhesive tape or absorption plate during laser processing may stick to the surface of the work.

For example, in the case of wet desmearing by using aqueous solution of potassium permanganate, the environmental pollution is increased due to treatment of the waste liquid.

Accordingly, in the case of laser processing at high laser power, it is hard to remove decomposition products in aftertreatment.

On the other hand, if a specified region of the work is cut off at once, the work (cut piece) drops off immediately after processing, and handling is difficult.

Further, the pressure-sensitive adhesive layer can be cut off by laser beam, while the support sheet cannot be cut off by laser beam.

As a result, it becomes difficult to peel off the dicing sheet from the work after application of laser processing.

It is hence hard to remove the deposit completely by aftertreatment.

Further, since the process includes a thermal process, edge portions are exposed to thermal damages.

As a result, the processing precision is lowered and the reliability also declines.

However, when the pressure-sensitive adhesive tape is used in the dicing method of semiconductor by using only the laser, the pressure-sensitive adhesive layer or base material may be melted by the heat of laser irradiation, and the decomposition products of pressure-sensitive adhesive layer or base material may invade into the interface of the pressure-sensitive adhesive sheet and semiconductor wafer, and may stick firmly to the interface area, and similar problems as mentioned above may occur.

When using water microjet, there is a limit in reducing the cutting width in dicing.

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