Detector

A detector and light-receiving component technology, applied in the field of sensors, can solve problems such as difficult-to-wear positions, increased probability of picking up interfering light, and increased light quantity, and achieves the effects of easy-to-wear positions, improved light-receiving efficiency, and easy calibration.
CN1919137AInactive Publication Date: 2007-02-28SHARP KK
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHARP KK
Publication Date
2007-02-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

A pair of light-receiving sections are placed at positions symmetric to a light-emitting axis of a light-emitting section on the inner circumferential surface in close contact with a finger, and each light-receiving section is composed of a plurality of light receiving regions so that by selecting a signal of the light receiving region which maximizes a reception signal, the propriety and the correction direction of a wearing position are displayed. According to the ring sensor, it becomes possible to enhance light-receiving efficiency of the light-receiving section and to increase a signal-noise ratio. It also becomes possible to facilitate wearing of the ring sensor at an optimum position.
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Description

technical field

[0001] The present invention relates to sensors for measuring biological information by optical means in a non-invasive manner. Background technique

[0002] Conventionally, a ring sensor having a light-emitting part and a light-receiving part on the inner peripheral surface of the ring has been used to detect the pulse waveform by optical means.

[0003] It is known that among hemoglobin of blood, oxyhemoglobin and reduced hemoglobin differ in light absorption and transmission characteristics depending on the wavelength of light. Oxyhemoglobin absorbs more infrared light than red light, while the optical property of reduced hemoglobin is that it absorbs more red light than infrared light.

[0004] Therefore, by wearing a ring sensor on the finger and pressing the light receiving part and the light emitting part against the finger, a specific pressure is applied to the blood vessels on the finger in advance. During the vasoconstriction period, the amount of ...

Claims

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