Method for forming pad character in push button switch and method for manufacturing cover member for push button switch

A method for manufacturing a cover member for a push button in which a substrate including a base section and at least one movable sections displaceable with respect to said base section said at least one movable section of said substrate are each securely mounted thereon with a key top, comprising the steps of:

• providing a laser-sensitive color developing agent including a pigment particle coated with a volatilization layer made of resin blended with an electromagnetic wave absorbing powder;
• forming a key top of a light-permeable thermosetting resin or elastomer material blended with said laser-sensitive color developing agent;
• and
• irradiating said key top with a laser beam thereby selectively destroying said volatilization layer of the pigment particle thereby exposing the pigment particles to form an indication section;
• and
• affixing said key top formed with said indication section to at least one of said at least one movable section.

A method for manufacturing a cover member in which a substrate including a base section and at least one movable section displaceable with respect to said base section and said at least one movable section of said substrate is each securely mounted thereon with a key top, comprising the steps of:

• providing a laser-sensitive color developing agent including a pigment particle coated with a volatilization layer made of resin blended with an electromagnetic wave absorbing powder;
• forming a key top of a light-permeable thermosetting resin or elastomer material blended with said laser-sensitive color developing agent;
• affixing said key top formed with said indication section to at least one of said at least one movable section;
• and
• irradiating said key top with a laser beam thereby selectively destroying said volatilization layer of said pigment particle thereby exposing said pigment particles to form an indication section.