Sensing assembly for mobile device

• US 8,304,733 B2
• Filed: 05/22/2009
• Issued: 11/06/2012
• Est. Priority Date: 05/22/2009
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Alameh, Rachid, Cauwels, Patrick, Jiang, Jun, Paitl, Kenneth
• Primary Examiner(s): Kim, Kiho
• Application Number:
  US12/471,062
• Publication Number:
  US 20100294938A1
• Time in Patent Office: 1,264 Days
• Field of Search: 250/349, 250/399.1
• US Class Current: 250/349
• CPC Class Codes: G06F 3/0308 comprising a plurality of distinctive and separately oriented light emitters or reflectors associated to the pointing device, e.g. remote cursor controller with distinct and separately oriented LEDs at the tip whose radiations are captured by a photo-detector associated to the screen
• CPC Class Codes: G06F 3/0325 using a plurality of light emitters or reflectors or a plurality of detectors forming a reference frame from which to derive the orientation of the object, e.g. by triangulation or on the basis of reference deformation in the picked up image
• CPC Class Codes: G06F 3/03549 Trackballs G06F3/03541 takes precedence
• CPC Class Codes: H03K 2217/94111 having more than one emitter

Abstract

An infrared sensing assembly for allowing detection of a location of an external object, as well as a mobile device employing such an assembly and related methods of operation, among other things, are disclosed. In one exemplary embodiment, the sensing assembly includes a pyramid-type housing structure having a central surface and multiple outer surfaces each of which extends in an inclined manner away from the central surface. The sensing assembly further includes multiple phototransmitters each positioned proximate to a respective one of the outer surfaces, and a photoreceiver positioned proximate to the central surface, with each respective photoelectric device being oriented so as to correspond to its respective surface. The sensing assembly is operated so that light is emitted from the phototransmitters, reflected by the object, and received by the photoreceiver. By processing signals from the photoreceiver that are indicative of the received light, the external object'"'"'s location is determined.

Claims

1. An infrared sensing assembly for allowing detection of a location of an external object, the sensing assembly comprising:

a pyramid-type housing structure having a central surface and a plurality of outer surfaces each of which extends in an inclined manner away from the central surface;

a plurality of first photoelectric devices, wherein each respective first photoelectric device is positioned proximate to a respective one of the outer surfaces; and

a second photoelectric device that is positioned proximate to the central surface,

wherein either each of the first photoelectric devices is a phototransmitter and the second photoelectric device is a photoreceiver, or vice-versa,

wherein each respective photoelectric device is oriented so as to correspond to the respective surface proximate to which the respective photoelectric device is positioned,

wherein each of the first photoelectric devices is positioned to emit or receive infrared light about a corresponding central axis that is normal to the respective one of the outer surfaces proximate to which the respective first photoelectric device is positioned, and each central axis is angularly offset from an additional axis extending normally outward from the central surface and is oriented in a different direction with respect to the others of the central axes about the additional axis,

wherein the sensing assembly is operated so that infrared light communicated between the one or more phototransmitters and the one or more photoreceivers includes infrared light portions originating at the one or more phototransmitters,

whereby the location of the object can be determined based upon the communicated infrared light, which is reflected off of the external object during transit.

2. The infrared sensing assembly of claim 1, wherein each of the one or more photoreceivers has an angular range of reception and each of the one or more phototransmitters has an angular range of transmission, and wherein the angular range of reception is larger than any of the angular ranges of transmission.

3. The infrared sensing assembly of claim 1, wherein each of the one or more phototransmitters is actuated to emit at least some of the infrared light at a respective one or more times.

4. The infrared sensing assembly of claim 3, wherein there are more than one of the phototransmitters, either (a) the respective phototransmitters are actuated in succession, or (b) all of the phototransmitters are actuated simultaneously.

5. The infrared sensing assembly of claim 1, wherein at least one structure is positioned in front of the one or more photoreceivers through which the communicated infrared light must pass in order to arrive at the one or more photoreceivers, and wherein the at least one structure includes one or more of a lens, a waveguide, a filter, and a shield.

6. A mobile device comprising the infrared sensing assembly of claim 1, wherein the mobile device includes at least one processing device, the processing device controlling actuation of the one or more phototransmitters and receiving signals from the one or more photoreceivers, wherein the mobile device is one of a cellular telephone and a personal digital assistant (PDA), and wherein the infrared sensing assembly at least one of (a) is positioned proximate a first edge of the mobile device, (b) is positioned at an interior region of the mobile device, and (c) serves as a navigation device of the mobile device.

7. A mobile device including an infrared sensing assembly by which a determination as to a location of an external object can be made, the mobile device comprising:

at least one photoreceiver;

a plurality of phototransmitters, wherein the respective phototransmitters are actuated to emit respective infrared light portions during respective successive time windows;

a pyramid-type structure having a central surface and a plurality of outer surfaces extending away from the central surface, wherein each outer surface is inclined relative to the central surface; and

a processing device coupled to each one of the at least one photoreceiver and the plurality of phototransmitters,

wherein the processing device makes the determination of the location of the external object based upon a plurality of signals provided at least indirectly to the processing device from the at least one photoreceiver,

wherein each respective signal is indicative of a respective reflected light portion received by the at least one photoreceiver during a respective one of the time windows during which was emitted a respective one of the infrared light portions,

wherein each respective phototransmitter is either oriented in a manner corresponding to a respective orientation of a respective one of the outer surfaces with which the respective phototransmitter is associated, or is actuated to emit the respective infrared light portion for reflection or refraction toward the respective one of the outer surfaces, so that the respective emitted infrared light portions are respectively transmitted away from the mobile device as respective transmitted infrared light portions in respective pluralities of directions about respective central axes that are normal relative to the respective ones of the outer surfaces with which the respective phototransmitters are associated, the central axes being in different directions angularly offset from and about an additional axis extending normally outward from the central surface, and

wherein the reflected light portions received by the at least one photoreceiver include the infrared light portions originating at the phototransmitters.

8. The mobile device of claim 7, wherein the at least one photoreceiver includes a first photoreceiver, wherein the infrared sensing assembly includes each of the first photoreceiver, the phototransmitters, and the pyramid-type structure, wherein the first photoreceiver and the phototransmitters are co-located at and supported by the pyramid-type structure, wherein the first photoreceiver is oriented so that a center axis of reception is the additional axis that is normal to the central surface.

9. The mobile device of claim 8, wherein the infrared sensing assembly is implemented as a navigation device on the mobile device, and the navigation device is tiltable relative to a remainder of the mobile device.

10. The mobile device of claim 8, wherein the infrared sensing assembly is mounted on a circuit board or card supported within the mobile device.

11. The mobile device of claim 7, wherein the respective phototransmitters are positioned proximate respective outer edges of the mobile device, wherein the pyramid-type structure is positioned substantially in between the outer edges of the mobile device, and wherein each respective phototransmitter is actuated to emit the respective infrared light portion for reflection toward the respective one of the outer surfaces, which in turn is configured to reflect the light portion outward away from the mobile device as the respective transmitted infrared light portion.

12. The mobile device of claim 11, wherein the at least one photoreceiver either (a) includes a plurality of photoreceivers respectively positioned proximate the respective phototransmitters, or (b) includes a single photoreceiver positioned proximate the central surface of the pyramid-type structure.

13. The mobile device of claim 11, wherein the mobile device has a transparent screen covering substantially all of a first surface of the mobile device, wherein the pyramid-type structure is made from a material that is also substantially transparent, wherein the respective emitted infrared light portions directed from the respective phototransmitters toward the pyramid-type structure are respectively directed by way of respective waveguides extending through or adjacent to the transparent screen, and wherein the infrared sensing assembly of the mobile device includes at least the phototransmitters, the at least one photoreceiver, the waveguides, and the pyramid-type structure.

14. The mobile device of claim 7, wherein the pyramid-type structure forms at least one lens positioned in front of each of the phototransmitters and the at least one photoreceiver, and wherein the emitted infrared light portions and the reflected light portions are refracted by the at least one lens.

15. A method of determining a location of an external object relative to a mobile device, the method comprising:

(a) providing a pyramid-type structure as part of the mobile device, the pyramid-type structure having a central surface and a plurality of outer surfaces extending away from the central surface and being inclined in relation thereto;

(b) actuating a plurality of infrared phototransmitters within a plurality of sequential time windows, respectively, so that respective amounts of infrared light are directed outward away from the mobile device, wherein each phototransmitter is positioned to emit the respective amount of infrared light about a respective central axis of transmission that is normal to the respective one of the outer surfaces with which the respective phototransmitter is associated, and each central axis of transmission is angularly offset from an additional axis extending normally outward from the central surface and is oriented in a different direction about the additional axis with respect to the others of the central axes of transmission;

(c) receiving by way of at least one infrared photoreceiver a plurality of reflected light portions during the plurality of sequential time windows, respectively, wherein each respective one of the reflected light portions includes the respective amount of the infrared light that was directed outward away from the mobile device as a result of the actuating of a respective one of the infrared phototransmitters during the respective sequential time window, and wherein the reflected light portions received by the at least one infrared photoreceiver include the infrared light amounts originating at each of the phototransmitters; and

(d) determining the location of the external object based upon signals from the at least one infrared photoreceiver indicative of the received reflected light portions.

16. The method of claim 15, wherein an infrared sensing assembly of the mobile device includes the phototransmitters, the at least one photoreceiver, and the pyramid-type structure, and further comprising:

(e) repeating (a)-(d) so as to determine that a portion of a body of a user has moved at least one of (i) across and over the infrared sensing assembly, and (ii) toward or away from the infrared sensing assembly.

17. The method of claim 16, wherein either it is determined that both (i) and (ii) have occurred and, in response, the mobile device determines that at least one command has been provided by the user;

or the infrared sensing assembly is a navigation device, and it is determined that (ii) has occurred and further that the navigation device has been touched by the user, and in response the mobile device determines that at least one command has been provided by the user.