Pulse wave sensor and semiconductor module
First Claim
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1. A pulse wave sensor comprising:
- a light emitting unit configured to emit light including green light and red light to a living body;
a first light receiving unit configured to convert, into a first electrical signal, the green light included in light emitted from said light emitting unit and reflected within said living body;
a second light receiving unit configured to convert, into a second electrical signal, the red light included in the light emitted from said light emitting unit and reflected within said living body; and
an arithmetic control unit configured to detect information related to a pulse wave in said living body based on a level difference between said first electrical signal and said second electrical signal,said arithmetic control unit including;
a subtracter configured to generate a third electrical signal showing the level difference between said first electrical signal and said second electrical signal,a first frequency component analysis unit configured to obtain a frequency spectrum of said first electrical signal, anda second frequency component analysis unit configured to obtain a frequency spectrum of said third electrical signal, andwherein the arithmetic control unit is configured to compare the frequency spectrum of said first electrical signal and the frequency spectrum of said third electrical signal to obtain the information related to the pulse wave in said living body based on a comparison result.
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Abstract
A pulse wave sensor includes: a white LED emitting white light to a human body; a G sensor converting, into a first electrical signal, green light included in light emitted from the white LED and reflected within the human body; an R sensor converting, into a second electrical signal, red light included in the light emitted from the white LED and reflected within the human body; and an arithmetic control unit configured to generate a signal showing a heart rate based on a level difference between the first electrical signal and the second electrical signal. Therefore, a distance between the G sensor and the R sensor does not have to be increased, so that an apparatus can be reduced in size.
7 Citations
15 Claims
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1. A pulse wave sensor comprising:
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a light emitting unit configured to emit light including green light and red light to a living body; a first light receiving unit configured to convert, into a first electrical signal, the green light included in light emitted from said light emitting unit and reflected within said living body; a second light receiving unit configured to convert, into a second electrical signal, the red light included in the light emitted from said light emitting unit and reflected within said living body; and an arithmetic control unit configured to detect information related to a pulse wave in said living body based on a level difference between said first electrical signal and said second electrical signal, said arithmetic control unit including; a subtracter configured to generate a third electrical signal showing the level difference between said first electrical signal and said second electrical signal, a first frequency component analysis unit configured to obtain a frequency spectrum of said first electrical signal, and a second frequency component analysis unit configured to obtain a frequency spectrum of said third electrical signal, and wherein the arithmetic control unit is configured to compare the frequency spectrum of said first electrical signal and the frequency spectrum of said third electrical signal to obtain the information related to the pulse wave in said living body based on a comparison result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A pulse wave sensor operable to receive light emitted from a light emitting unit to a living body and reflected within the living body, the light emitting unit operable to emit light including green light and red light, the pulse wave sensor comprising:
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a first light receiving unit configured to convert, into a first electrical signal, the green light included in light emitted from said light emitting unit and reflected within said living body; a second light receiving unit configured to convert, into a second electrical signal, the red light included in the light emitted from said light emitting unit and reflected within said living body; and an arithmetic control unit configured to detect information related to a pulse wave in said living body based on a level difference between said first electrical signal and said second electrical signal, said arithmetic control unit including; a subtracter configured to generate a third electrical signal showing the level difference between said first electrical signal and said second electrical signal, a first frequency component analysis unit configured to obtain a frequency spectrum of said first electrical signal, and a second frequency component analysis unit configured to obtain a frequency spectrum of said third electrical signal, and wherein the arithmetic control unit is configured to compare the frequency spectrum of said first electrical signal and the frequency spectrum of said third electrical signal to obtain the information related to the pulse wave in said living body based on a comparison result.
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15. A pulse wave sensor comprising:
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a light emitting unit configured to emit light including green light and red light to a living body; a first light receiving unit configured to convert, into a first electrical signal, the green light included in light emitted from said light emitting unit and reflected within said living body; a second light receiving unit configured to convert, into a second electrical signal, the red light included in the light emitted from said light emitting unit and reflected within said living body; and an arithmetic control unit configured to detect information related to a pulse wave in said living body based on a level difference between said first electrical signal and said second electrical signal, wherein said first electrical signal includes a pulse wave component that changes in accordance with the pulse wave in said living body, and a body motion component that changes in accordance with a body motion of said living body, said second electrical signal includes said body motion component, and said arithmetic control unit is configured to remove said body motion component from said first electrical signal based on said second electrical signal to generate a third electrical signal including said pulse wave component, and to detect the information related to the pulse wave in said living body based on said third electrical signal.
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Specification