Key top element, push button switch element and method for manufacturing same

A method for manufacturing a key top element, comprising of steps of:

• subjecting a substrate sheet member made of a light-permeable resin material to color printing using fine dots of a plurality of colors by feeding a printing unit with color design data obtained by computer design techniques, to thereby form an on-demand printed layer including at least one printed display section;
• forming a colored layer which has a color selected from the group consisting of white and silver on one surface of said substrate sheet member having said printed display section printed thereon to provide a printed sheet;
• and
• integrally mounting at least one key top member made of a light permeable resin material on a pre-determined portion of said printed sheet so that said printed display section is arranged between said key top member and said colored layer.

A push button switch element comprising:

• at least one light-permeable key top member formed of a light-permeable resin material;
• a light-permeable rubber cover base;
• and
• a printed sheet interposedly arranged between said light-permeable key top member and said light-permeable rubber cover base and formed with at least one display section;
• said printed sheet including a light-permeable resin sheet member, a graphic printed layer folmed on one surface of said light-permeable resin sheet member of the fine dots of a plurality of colors so that said display section is light-permeable, and a light-reflecting light-blocking layer, and said printed sheet being arranged with respect to said light-permeable key top member so that said graphic printed layer is arranged between said light-permeable key top member and said light-reflecting light-blocking layer.

A method for manufacturing a push button switch element, comprising the steps of:

• forming a graphic printed layer including at least one light-permeable display section on one surface of a light-permeable resin sheet member using fine dots of a plurality of colors by means of a printer;
• arranging a light-reflecting light-blocking layer on a lower side of said graphic printed layer to provide a printed sheet having an upper surface and a lower surface and having said light-reflecting light-blocking layer arranged between said graphic printed layer and said lower surface of said printed sheet;
• and
• bonding at least one light-penneable key top member made of a light-permeable resin material to said upper surface of said printed sheet and bonding a light-permeable rubber cover base to said lower surface of said printed sheet to provide said push button switch element.

A push button switch element comprising:

• at least one light-permeable key top member formed of a light-permeable resin material;
• a light-permeable rubber cover base;
• and
• a printed sheet interposedly arranged between said light-permeable key top member and said light-permeable rubber cover base and formed with at least one display section;
• said printed sheet including a light-permeable resin sheet member, a graphic printed layer formed on one surface of said light-permeable resin sheet member of fine dots of a plurality of colors so that said display section is light-permeable, a light-reflecting light-blocking layer arranged on a lower side of said graphic printed layer, and a semitransparent white layer arranged on a lower surface of said light-reflecting light-blocking layer.

A push button switch element comprising:

• at least one light-permeable key top member formed of a light-permeable resin material;
• a light-permeable rubber cover base;
• and
• a printed sheet interposedly arranged between said light-permeable key top member and said light-permeable rubber cover base and formed with at least one display section;
• said printed sheet including a light permeable resin sheet member, a graphic printed layer formed on one surface of said light permeable resin sheet member of fine dots of a plurality of colors so that said display section is light-penneable, a light-reflecting light-blocking layer arranged on a lower side of said graphic printed layer and having a light reflectance of 50% or more, and a semitransparent white layer arranged on a lower surface of said light-reflecting light-blocking layer.

A method for manufacturing a push button switch element, comprising the steps of:

• forming a graphic printed layer including at least one light permeable display section on one surface of a light-permeable resin sheet member using fine dots of a plurality of colors by means of a printer;
• arranging a light-reflecting light-blocking layer on a lower side of said graphic printed layer and arranging a semitransparent white layer on a lower surface of said light-reflccting light-blocking layer to provide a printed sheet;
• and
• bonding at least one light-permeable key top member made of a light-permeable resin material to an upper surface of said printed sheet and bonding a light-permeable rubber cover base to a lower surface of said printed sheet to provide said push button switch element.

A method for manufactuing a push button switch element, comprising the steps of:

• forming a graphic printed layer including at least one light-permeable display section on one surface of a light-permeable resin sheet member using fine dots of a plurality of colors by means of a printer;
• arranging a light-reflecting light-blocking layer having light reflectance of 50% or more on a lower side of said graphic printed layer and arranging a semitransparent white layer on a lower surface of said light-reflecting light-blocking layer to provide a printed sheet;
• and
• bonding at least one light-permeable key top member made of a light-permeable resin material to an upper surface of said printed sheet and bonding a light-permeable rubber cover base to a lower surface of said printed sheet to provide said push button switch element.