Inputting information using holographic techniques

• US 8,089,456 B2
• Filed: 06/30/2004
• Issued: 01/03/2012
• Est. Priority Date: 06/30/2004
• Status: Active Grant

• Current Assignee: Telecom Italia S.p.A.
• Original Assignee: Telecom Italia S.p.A.
• Inventors: Grego, Giorgio, Roccato, Diego
• Primary Examiner(s): Eisen, Alexander
• Assistant Examiner(s): PHAM, VIET DAVID
• Application Number:
  US11/631,078
• Publication Number:
  US 20090184851A1
• Time in Patent Office: 2,743 Days
• Field of Search: 345156-173, 359/22
• US Class Current: 345/156
• CPC Class Codes: G03H 1/0005 Adaptation of holography to specific applications holographic optical element G02B5/32; holographic scanner G02B26/106; recognition using holographic mask G06V10/88; holographic memories G11B7/0065, G11C13/042
• CPC Class Codes: G03H 2001/0061 in haptic applications when the observer interacts with the holobject
• CPC Class Codes: G03H 2001/0066 for wavefront matching wherein the hologram is arranged to convert a predetermined wavefront into a comprehensive wave, e.g. associative memory recognition using holographic masks G06V10/88
• CPC Class Codes: G03H 2001/0413 for recording transmission holograms
• CPC Class Codes: G03H 2001/0415 for recording reflection holograms
• CPC Class Codes: G03H 2001/226 Virtual or real
• CPC Class Codes: G06F 3/0426 tracking fingers with respect to a virtual keyboard projected or printed on the surface virtual keyboards on touch screens G06F3/04886

Abstract

A method for inputting commands to a holographic input system, includes the steps of generating a virtual image of an input device by illuminating a hologram of the input device by means of a corresponding reference beam, the hologram being prerecorded on a holographic support; optically detecting a position of at least one actuator for operating the input device with respect to the virtual image of the input device; and issuing at least one command signal corresponding to the position of that at least one actuator as optically detected. The optical detection operation further includes providing at least one actuation hologram corresponding to the at least one actuator being placed at a specified position with respect to the virtual image of the input device, illuminating the at least one actuator with a beam, in order to obtain scattering into a corresponding object beam interacting with one actuation hologram through the corresponding object beam; generating a respective actuation detection beam through the interaction; and detecting the respective actuation detection beam to issue the command signal.

Claims

1. A method for inputting commands, comprising the steps of:

generating a virtual image of an input device by illuminating a hologram of said input device, said hologram being prerecorded on a holographic support;

optically detecting an intended operation of said input device based on an actual position of an actuator with respect to said virtual image of said input device, based on at least one predetermined position of said actuator with respect to said virtual image of said input device, wherein each predetermined position corresponds to a distinct operation of said input device; and

issuing at least one command signal for executing the intended operation of said input device as optically detected, said optical detection step comprising;

providing at least one actuation hologram corresponding to said actuator being placed at the at least one predetermined position with respect to said virtual image of said input device, wherein the at least one actuation hologram is prerecorded, separately from the hologram of said input device, with an object beam illuminating on said actuator and at least one respective reference beam;

illuminating said actuator placed at the actual position of said actuator with the object beam;

detecting an actuation detection beam generated by an interaction between the object beam and the actuator;

identifying one reference beam, among the at least one respective reference beam, that conforms to the actuation detection beam; and

determining the predetermined position of said actuator corresponding to the identified reference beam and designating the operation corresponding to the identified predetermined position of said actuator as the intended operation.

2. The method of claim 1, comprising a step of prerecording on said holographic support said at least one actuation hologram.

3. The method of claim 2, wherein said prerecording step comprises placing said actuator at said at least one predetermined position with respect to said virtual image and recording a corresponding actuation hologram through the respective reference beam.

4. The method of claim 1, wherein said actuation hologram is located in a different area of said holographic support with respect to an area in which the hologram of the input device is recorded.

5. The method of claim 1, wherein the area used by said actuation hologram is substantially smaller in size with respect to an area in which the hologram of the input device is recorded.

6. The method of claim 1, wherein identifying the position of said actuator comprises detecting that said actuation detection beam corresponds to a conjugate beam of the respective reference beam used for recording said respective actuation hologram.

7. The method of claim 6, wherein the conjugate beam of said respective reference beam used for recording said respective actuation hologram is also detected.

8. The method of claim 1, wherein said input device is a keyboard.

9. The method of claim 1, wherein said actuation hologram has a size comparable with the size of a key of the input device.

10. The method of claim 1, further comprising the step of supplying an audio or visual feedback of said step of detecting said respective actuation detection beam.

11. The method of claim 1, comprising the step of recording said hologram of the input device and said actuation hologram on separate holographic supports and assembling said supports so as to form said holographic support.

12. The method of claim 1, wherein said at least one actuation hologram is recorded in a same area of the holographic support by varying an incidence angle of the respective reference beam.

13. A system for inputting commands, comprising:

an optical system for generating a virtual image of an input device by illuminating a hologram of said input device, said hologram being prerecorded;

an optical detection module for optical detection of an intended operation of said input device based on an actual position of an actuator with respect to said virtual image of said input device, based on at least one predetermined position of said actuator with respect to said virtual image of said input device, wherein each predetermined position corresponds to a distinct operation of said input device; and

an issuing module for issuing at least one command signal for executing the intended operation of said input device as optically detected, said optical detection module comprising;

at least one actuation hologram corresponding to said actuator being placed at the at least one predetermined position with respect to said virtual image of said input device, wherein the at least one actuation hologram is prerecorded, separately from the hologram of said input device, with an object beam illuminating on said actuator and at least one respective reference beam; and

an optical system for illuminating said actuator placed at the unknown position with the object beam, wherein the optical detection module is configured to;

detect an actuation detection beam generated by an interaction between the object beam and the actuator,

identify one reference beam, among the at least one respective reference beam, that conforms to the actuation detection beam; and

determine the predetermined position of said actuator corresponding to the identified reference beam and designating the operation corresponding to the identified predetermined position of said actuator as the intended operation.

14. The system of claim 13, wherein said at least one prerecorded actuation hologram is prerecorded on said holographic support.

15. The system of claim 13, wherein the at least one prerecorded actuation hologram includes a plurality of prerecorded actuation holograms and said prerecorded actuation holograms are recorded separately with respect to each other through corresponding reference beams.

16. The system of claim 14, wherein said holographic support carries different areas for recording said at least one prerecorded actuation hologram with respect to an area for recording the hologram of the input device.

17. The system of claim 14, wherein the area used by said at least one actuation hologram is substantially smaller in size with respect to an area in which the hologram of the input device is recorded.

18. The system of claim 13, wherein said input device is a keyboard.

19. The system of claim 14, wherein said at least one actuator hologram has a size similar to a size of a key of the input device.

20. The system of claim 13, wherein said optical detection module is an array of charge coupled devices.

21. The system of claim 13, wherein the optical detection module comprises a module for audio or visual feedback of the detection of said respective actuation detection beam.

22. The system of claim 13, wherein said holographic support comprises a plurality of assembled holographic supports.

23. The system of claim 13, wherein said holographic support carries said at least one actuation hologram in a same area.

24. A holographic support comprising the system of claim 13.

25. A method for producing a holographic support of claim 24, comprising the steps of:

recording the hologram of said input device on said holographic support by means of a first object beam and a first reference beam; and

recording, on said holographic support by means of a second object beam and at least one respective second reference beam, at least one actuator hologram of the actuator being placed at the at least one predetermined position with respect to the virtual image of said hologram of said input device.