Keypad with virtual image

• US 7,830,368 B2
• Filed: 05/31/2007
• Issued: 11/09/2010
• Est. Priority Date: 06/06/2006
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Hulme-Lowe, Alan G., Jerry, Glen A., Yi, Jennifer R., Free, M. Benton, Dobbs, James N., Wetzels, Serge, Strand, John T., Huizinga, John S., Marttila, Charles A., Dudley, William R.
• Primary Examiner(s): Dharia; Prabodh M
• Application Number:
  US11/755,819
• Publication Number:
  US 20070279391A1
• Time in Patent Office: 1,258 Days
• Field of Search: 345156-176, 345/607, 348/E13.028, 355/28, 355/30, 355/50, 355/55, 355/79, 355/83, 359/626, 359/456, 359/460, 235/462.11, 235/462.1, 235/462.42
• US Class Current: 345/175
• CPC Class Codes: G02B 27/60 Systems using moiré fringes
• CPC Class Codes: G02B 30/27 involving lenticular arrays
• CPC Class Codes: G02B 30/56 by projecting aerial or floating images
• CPC Class Codes: G06F 3/0238 Programmable keyboards key guide holders G06F3/0224
• CPC Class Codes: H01H 13/83 characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
• CPC Class Codes: H01H 2219/039 Selective or different modes of illumination
• CPC Class Codes: H01H 2219/066 Lens
• CPC Class Codes: H01H 2239/006 Containing a capacitive switch or usable as such
• CPC Class Codes: H01H 2239/068 3D
• CPC Class Codes: H04N 13/307 using fly-eye lenses, e.g. arrangements of circular lenses

Abstract

A keypad having a virtual floating image that appears to a user to be in a plane other than the apparent plane of the keypad surface. More particularly, the indicia on the keypad appear to float above or below the surface of the device. The keypad can be, for example, the keypad on a cell phone. For such an application there would be more than one array of indicia present on the keypad. For example, there might be ten arrays of indicia, which provide the numerals from 0 to 9 and two more arrays to provide virtual images of the * and # keys. In some embodiments, the keypad is integrated with an illumination source that light up the indicia. The present disclosure also provides a method of manufacturing a key pad with a virtual floating image.

Claims

1. A keypad, comprising:

a film having a first primary surface opposite a second primary surface;

a first and a second array of indicia spaced apart on the first primary surface;

an array of lenses on the second primary surface,

wherein the first and second arrays of indicia and the array of lenses are configured such that they cooperate to generate a first virtual image and second virtual image wherein the virtual images are different and both appear to be in a plane outside of the film;

a flexible printed circuit positioned adjacent the first primary surface of the film, wherein the flexible printed circuit includes a first touch sensitive electrode pad positioned adjacent the first array of indicia and a second touch sensitive electrode pad positioned adjacent the second array of indicia.

2. The keypad of claim 1, further comprising electrical components configured to detect the presence of a user'"'"'s finger in the proximity of the first array of indicia.

3. The keypad of claim 1, further comprising electrical components arranged to detect contact between a user'"'"'s finger and the film in the proximity of the first array of indicia.

4. The keypad of claim 1, wherein the first and second virtual images are in the same plane.

5. The keypad of claim 1, wherein the first virtual image is in a plane above the film and the second virtual image is in a plane below the film.

6. The keypad of claim 1, wherein at least one of the virtual images is a number or letter.

7. The keypad of claim 1, further comprising a light source configured to illuminate the virtual images.

8. The keypad of claim 7, further comprising a waveguide positioned adjacent to the first primary surface of the film, wherein the waveguide is configured to receive and transmit light emitted from the light source.

9. The keypad of claim 7, wherein the light source is configured to direct light into a periphery edge of the film.

10. The keypad of claim 7, wherein the indicia are coated with an optical grade adhesive.

11. The key pad of claim 1, wherein the film includes a plurality of arrays of lenses space apart on the second primary surface of the film.

12. The keypad of claim 1, further comprising a dome film positioned between the flexible printed circuit board and the first primary surface of the film.

13. The keypad of claim 1, wherein the array of lenses includes a plurality of single optical spherical lens elements.

14. A user actuated switch, comprising:

a layer of transparent material having a first side and a second side, wherein the first side includes an array of optical elements having a first pitch and the second side includes an array of indicia having a second pitch such that the layer of transparent material creates a virtual image in a plane outside of the layer of transparent material; and

an electrical switch mounted adjacent the layer of transparent material;

an illumination source positioned to illuminate an edge of the layer of transparent material,

wherein the indicia act as light extraction features that direct light from the illumination source out of the layer of transparent material.

15. The switch of claim 14, wherein a plurality of different arrays of indicia corresponding to a plurality of electrical switches cooperatively provide a data entry keypad.

16. The switch of claim 14, wherein the optical elements are converging lenses.

17. The switch of claim 14, wherein the first pitch is between about 10 microns to 300 microns.

18. The switch of claim 14, wherein the layer of transparent material has light extraction features that direct light from the illumination source out of the layer of transparent material.

19. The switch of claim 14, wherein the layer of transparent material comprises at least one polymeric layer adhered to a layer of glass.

20. The switch of claim 14, further comprising a contrast enhancing layer adjacent to the second side, wherein the contrast enhancing layer is formed by a process selected from the group consisting of vapor deposition, printing, laminating, embossing and coating.

21. The switch of claim 14, wherein the electrical switch is resistive.

22. The switch of claim 14, wherein the electrical switch is capacitive.

23. A method of manufacturing a user actuated switch, comprising:

providing a layer of transparent material having a first side and a second side, wherein the first side includes an array of optical elements having a first pitch and the second side includes an array of indicia having a second pitch such that the layer of transparent material creates a virtual image in a plane outside of the layer of transparent material; and

providing an electrical switch mounted adjacent the layer of transparent material; and

providing a flexible printed circuit positioned adjacent the first primary surface of the film, wherein the flexible printed circuit includes a first touch sensitive electrode pad positioned adjacent the first array of indicia and a second touch sensitive electrode pad positioned adjacent the second array of indicia.

24. The method of claim 23, wherein the layer of transparent material is formed from polymer by casting from a monomeric or oligomeric precursor, and wherein the indicia and optical elements are formed during the casting.

25. The method of claim 23, wherein at least one of the indicia or optical elements is formed by embossing.

26. The method of claim 23, wherein at least one of the indicia or optical elements is formed by injection molding.

27. The method of claim 23, wherein at least one of the indicia or optical elements is formed by a removal process.

28. The method of claim 23, wherein indicia are formed by a method selected from the group consisting of printing, casting, etching, ablation, and molding.