Reflective proximity sensor with improved smudge resistance and reduced crosstalk
First Claim
1. An electronic device comprising:
- a proximity sensor having a radiation emitter and a radiation detector;
a protective layer positioned above the proximity sensor, the protective layer having a top surface and a bottom surface adjacent the proximity sensor;
a groove formed in the bottom surface of the protective layer; and
a radiation barrier in the groove in the bottom surface of the protective layer.
1 Assignment
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Accused Products
Abstract
An electronic device includes a protective layer above a proximity sensor having a radiation emitter and a radiation detector. A groove, which may be wedge shaped, is formed in the bottom surface of the protective layer. A radiation barrier, which may be reflective or absorptive material, is placed in the groove in the bottom surface of the protective layer. A light blocking coating may be applied to the bottom surface and the groove of the protective layer to prevent the passage of visible radiation and permit the passage of infrared radiation. A radiation shield may be positioned between the emitter and the detector directly below the radiation barrier. Alignment features may be formed on the mating surfaces of the radiation barrier and radiation shield to align the protective layer with respect to the radiation shield and proximity sensor.
16 Citations
24 Claims
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1. An electronic device comprising:
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a proximity sensor having a radiation emitter and a radiation detector; a protective layer positioned above the proximity sensor, the protective layer having a top surface and a bottom surface adjacent the proximity sensor; a groove formed in the bottom surface of the protective layer; and a radiation barrier in the groove in the bottom surface of the protective layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of improving smudge resistance and reducing crosstalk in a reflective proximity sensor, the method comprising:
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positioning a protective layer above a proximity sensor having a radiation emitter and a radiation detector directed toward the protective layer, the protective layer having a top surface and a bottom surface adjacent the proximity sensor; forming a groove in the bottom surface of the protective layer; and placing a radiation barrier in the groove in the bottom surface of the protective layer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. An apparatus for improving smudge resistance and reducing crosstalk in a reflective proximity sensor, the apparatus comprising:
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a protective layer positioned above a proximity sensor having a radiation emitter and a radiation detector directed toward the protective layer, the protective layer having a top surface and a bottom surface adjacent the proximity sensor; and first means for blocking radiation placed in a groove in the bottom surface of the protective layer directly above the means for blocking radiation positioned between the emitter and the detector of the proximity sensor. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification