Contoured capacitive touch control panel

• US 7,486,280 B2
• Filed: 08/04/2005
• Issued: 02/03/2009
• Est. Priority Date: 08/04/2005
• Status: Expired due to Fees

• Current Assignee: Uniplas Enterprises Pte Ltd.
• Original Assignee: Uniplas Enterprises Pte Ltd.
• Inventors: Leong, Peh Swee, Iandoli, Raymond Charles
• Primary Examiner(s): Dharia; Prabodh M.
• Application Number:
  US11/196,845
• Publication Number:
  US 20070031161A1
• Time in Patent Office: 1,279 Days
• Field of Search: 345/173, 345/174, 345/418, 345/581, 345/179, 178/20.01, 178/20.02, 399/184, 399/6, 399/82, 399/21, 399/81, 399/407, 264/132, 264/161, 264/493, 264/342.R, 368/205, 463/1, 463/16, 512/98
• US Class Current: 345/173
• CPC Class Codes: B29C 45/14778 the article consisting of a material with particular properties, e.g. porous, brittle

Abstract

A method of manufacturing a contoured capacitive touch screen control panel includes printing control indicia on at least one of a front surface and a back surface of a flexible film and printing conductive ink pads on a back surface of the film in alignment with the control indicia. The printed film is placed in an injection mold with the conductive pads in contact with a back surface of the mold so that a space remains between the front surface of the flexible film and a front surface of the mold. The method then includes flowing a molten plastic into the space in engagement with the front surface of the film to form a control panel with the printed indicia being visible through the control panel from a face of the control panel opposite from the film.

Claims

1. A method of manufacturing a contoured capacitive touch screen control panel comprising:

printing control indicia on at least one of a front surface and a back surface of a flexible film;

printing conductive ink pads on a back surface of the film with each pad being aligned with respective printed control indicia;

disposing the printed film in an injection mold with the conductive pads printed on the back surface of the flexible film being in contact with a back surface of the mold so that a space remains between the front surface of the flexible film and a front surface of the mold; and

flowing a molten plastic into the space in engagement with the front surface of the film to form a control panel with the printed indicia being visible through the control panel from a face of the control panel opposite from the film molded in situ.

2. The method of claim 1, wherein the conductive pad is printed using a gravure process, offset lithography, tampo printing, screen printing, or digital printing.

3. The method of claim 1, wherein the mold comprises film retainers, the method further comprising bending the film to fit the retainers so that the film is held in biased engagement against the back surface of the mold.

4. The method of claim 1, wherein the mold comprises film retainers, the method further comprising aligning the film on the film retainers.

5. The method of claim 1, further comprising forming the film to have a desired contour before disposing the film in the mold.

6. The method of claim 5, further comprising die cutting a formed film to a size sufficient for disposing the formed film in the mold.

7. The method of claim 5, wherein forming the film comprises a vacuum forming technique.

8. The method of claim 5, wherein forming the film comprises a pressure forming technique.

9. A contoured capacitive touch screen control panel comprising a film being molded in situ with the control panel, the film comprising indicia printed on at least one of a front surface and a back surface of the film and conductive ink pads printed on the back surface of the film with each pad being aligned with respective control indicia printed on the film.

10. The panel of claim 9, wherein the plastic is an acrylic or polycarbonate.

11. The panel of claim 9, wherein the film is a polycarbonate, a polyethylene terephthalate (PET), a polyester, or an acrylic.

12. The panel of claim 9, wherein the film has a thickness between about 0.1 mm and 0.2 mm.

13. The panel of claim 9, wherein film has a thickness between about 0.125 mm and 0.175 mm.