Optical proximity sensor system having reduced sensitivity to distinct near-field optical effects
First Claim
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1. A portable electronic device comprising:
- a proximity sensing device having an emitter and a detector;
a housing for containing the proximity sensing device; and
an optical interface forming a face of the housing through which radiation between the emitter and the detector pass, wherein the optical interface comprises an oleophobic coating defining a first region and a second region over the optical interface, wherein the first region and the second region have a different optical property such that optical interference from an optical interface near-field object on the proximity sensing device is reduced without reducing a sensitivity of the proximity sensing device to a target near-field object.
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Abstract
A portable electronic device including a proximity sensing device having an emitter and a detector. The electronic device further including a housing for containing the proximity sensing device which includes an optical interface forming a face of the housing through which radiation between the emitter and the detector pass. The optical interface may include an oleophobic coating which is selectively modified such that optical interference from an optical interface near-field object on the proximity sensing device is reduced without reducing a sensitivity of the proximity sensing device to a target near-field object.
19 Citations
20 Claims
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1. A portable electronic device comprising:
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a proximity sensing device having an emitter and a detector; a housing for containing the proximity sensing device; and an optical interface forming a face of the housing through which radiation between the emitter and the detector pass, wherein the optical interface comprises an oleophobic coating defining a first region and a second region over the optical interface, wherein the first region and the second region have a different optical property such that optical interference from an optical interface near-field object on the proximity sensing device is reduced without reducing a sensitivity of the proximity sensing device to a target near-field object. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A portable multi-function personal device comprising:
a proximity sensor system having; an optical interface cover; and an optical emitter and an optical detector positioned below the cover, the cover having been treated to exhibit decreased surface tension on its top surface except for a proximity sensor area directly above the optical emitter and the optical detector where radiation from the optical emitter and the optical detector passes. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A proximity sensing system having a modified response to near-field optical effects comprising:
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a portable electronic device having an outer casing comprising an optically transparent face; a proximity sensing device positioned within the outer casing, the proximity sensing device having an optical emitter and an optical detector facing the optically transparent face such that radiation from the emitter passes through the optically transparent face; and an oleophobic coating formed on a side of the optically transparent face opposite the proximity sensing device, the oleophobic coating having at least one optically modified portion positioned over the optical emitter or the optical detector such that optical interference from an optical interface near-field object on the proximity sensing device is reduced without reducing a sensitivity of the proximity sensing device to a target near-field object. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification