Heart rate sensor with high-aspect-ratio photodetector element
First Claim
Patent Images
1. An apparatus comprising:
- a light source;
one or more discrete, high-aspect-ratio (HAR) photodetectors, each HAR photodetector having a die with a photosensitive area and configured to provide an output signal that indicates the total amount of light that is incident on the photosensitive area of the die of the HAR photodetector, the photosensitive area of each HAR photodetector having;
a first edge having a first length, anda first width in a direction perpendicular to the first edge; and
control logic, the control logic communicatively connected with the light source and each HAR photodetector and configured to;
cause the light source to emit light,obtain one or more measured light intensity measurements from the one or more HAR photodetectors based on the output signal from each HAR photodetector, anddetermine a heart rate measurement based, at least in part, on the one or more light intensity measurements,wherein;
the ratio of the first length to the first width of each photodetector element is substantially between 3;
1 to 5;
1,the light source is mounted on a surface of a substrate, andeach photosensitive area faces away from the surface of the substrate on which the light source is mounted.
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Abstract
Blood oxygenation sensors including high-aspect-ratio photodetector elements are discussed herein. Such high-aspect-ratio photodetector elements may provide improved signal-strength-to-power-consumption performance for blood oxygenation sensors incorporating such photodetector elements as compared with blood oxygenation sensors incorporating, for example, square photodetector elements.
209 Citations
30 Claims
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1. An apparatus comprising:
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a light source; one or more discrete, high-aspect-ratio (HAR) photodetectors, each HAR photodetector having a die with a photosensitive area and configured to provide an output signal that indicates the total amount of light that is incident on the photosensitive area of the die of the HAR photodetector, the photosensitive area of each HAR photodetector having; a first edge having a first length, and a first width in a direction perpendicular to the first edge; and control logic, the control logic communicatively connected with the light source and each HAR photodetector and configured to; cause the light source to emit light, obtain one or more measured light intensity measurements from the one or more HAR photodetectors based on the output signal from each HAR photodetector, and determine a heart rate measurement based, at least in part, on the one or more light intensity measurements, wherein; the ratio of the first length to the first width of each photodetector element is substantially between 3;
1 to 5;
1,the light source is mounted on a surface of a substrate, and each photosensitive area faces away from the surface of the substrate on which the light source is mounted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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a first light source mounted on a surface of a substrate; a second light source supported by the substrate; a HAR photodetector interposed between the first light source and the second light source, having a die with a photosensitive area, and configured to provide an output signal that indicates the total amount of light that is incident on the photosensitive area of the die of the HAR photodetector; and control logic, the control logic communicatively connected with the first light source, the second light source, and the HAR photodetector and configured to; cause the first light source and the second light source to emit light, obtain measured light intensity measurements from the HAR photodetector based on the output signal, and determine a heart rate measurement based, at least in part, on the light intensity measurements, wherein; the photosensitive area faces away from the surface of the substrate on which the first light source is mounted, the photosensitive area of the HAR photodetector is rectangular in shape, has a first edge with a first length, and has a second edge, perpendicular to the first edge, with a second length, and the ratio of the first length to the second length is substantially between 3;
1 to 5;
1. - View Dependent Claims (16, 17, 18, 19)
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20. An apparatus comprising:
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a light source mounted on a surface of a substrate; one or more high-aspect-ratio (HAR) photodetectors, each HAR photodetector having a die with a total photosensitive area, wherein; at least 90% of the total photosensitive area is defined by a first dimension along a first axis and a second dimension along a second axis perpendicular to the first axis, and each HAR photodetector is configured to provide an output signal that indicates the total amount of light that is incident on the total photosensitive area of the HAR photodetector; and control logic, the control logic communicatively connected with the light source and each HAR photodetector and configured to; cause the light source to emit light, obtain one or more measured light intensity measurements from the one or more HAR photodetectors based on the output signal from each HAR photodetector, and determine a heart rate measurement based, at least in part, on the one or more light intensity measurements, wherein, for each HAR photodetector; the ratio of the first dimension to the second dimension is substantially between 3;
1 to 5;
1, andthe total photosensitive area faces away from the surface of the substrate on which the light source is mounted. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification